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SECR K and SR K1 classes

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Adapted from the English Wikipedia article SECR K and SR K1 classes, available under CC BY-SA 4.0Updated 29 November 202546 sources
South Eastern and Chatham Railway
IndustryRailway
Founded1899
Headquarters
Ashford
,
England


Template:Infobox locomotive

The SECR K class comprised a series of 2-6-4 tank locomotives engineered by Richard Maunsell in 1914 for high-speed passenger services on the South Eastern and Chatham Railway (SECR), which served routes connecting London with south-east England. The Southern Railway (SR) later introduced the K1 class, a three-cylinder adaptation developed in 1925 to accommodate a more restrictive loading gauge. These locomotives were among the earliest outside the Great Western Railway (GWR) to adopt and enhance the core design philosophies of power and standardisation pioneered by GWR's Chief Mechanical Engineer, George Jackson Churchward. Their design drew inspiration from the GWR 4300 Class, incorporating the Midland Railway’s emphasis on straightforwardness and maintainability.

Mechanically, the K class shared many features with the SECR N class, a series of mixed-traffic 2-6-0 locomotives. Notably, this was one of Britain's pioneering classes to employ the 2-6-4 wheel configuration. Production commenced near the conclusion of World War I; however, wartime manufacturing limitations delayed the prototype’s completion at Ashford railway works. The class was introduced as part of SECR's initiative to modernise its fleet by replacing aging 4-4-0 passenger engines.

In total, twenty-one units were produced: twenty two-cylinder K class engines and a single three-cylinder K1 class locomotive, built initially in 1917 and subsequently between 1925 and 1926. They operated primarily on the Eastern section of the Southern Railway network and were collectively known as the River class from 1925 onward, each named after regional rivers. Railway crews nicknamed them "Rolling Rivers" due to their tendency for instability at higher speeds. Following a serious incident near Sevenoaks in Kent in 1927, these locomotives were reconstructed into two-cylinder SR U class and three-cylinder SR U1 class 2-6-0 configurations respectively. They remained active under British Railways until final withdrawal in 1966. One rebuilt example, No. 31806, was formerly preserved on the Mid Hants Railway but has been maintained operational on the Swanage Railway in Dorset since 2014.

Background

The choice of locomotive suitable for operation on the South Eastern and Chatham Railway (SECR) was influenced by three main factors: heavy passenger train weights, substandard track conditions, and fragile, lightly constructed bridges.[1] On the former London, Chatham and Dover Railway (LCDR) lines, which the SECR absorbed in 1899, beach pebbles had been employed as ballast[2] instead of the conventional angular ballast that interlocks to secure the track. This cost-saving measure in track construction meant that only locomotives with low axle loadings could safely traverse these routes.[1] Consequently, the SECR was unable to implement a unified approach to reduce the variety of locomotive types inherited from its two predecessor companies. Despite a rise in passenger and freight volumes between Template:Stnlnk and the coastal areas of Kent during the early 20th century, the Operating Department was compelled to rely on a mix of outdated and underpowered 4-4-0 and 0-6-0 locomotives capable of running within infrastructure limitations.[3] This often necessitated double-heading, increasing operational expenses.[4]

In 1913, Richard Maunsell took over as CME of the SECR after Harry Wainwright was forced into retirement. Wainwright had left behind a fleet of competent yet unremarkable locomotive classes that were inadequate for handling longer and heavier trains.[1] Upon assessment, Maunsell devised a plan to introduce six standardized classes utilizing only two boiler designs, intended to cover all traffic requirements across the railway.[5] The initial class developed was the N class 2-6-0, which provided a versatile mixed-traffic locomotive. For express passenger services capable of managing heavy boat trains, Maunsell aimed to enhance the existing L class 4-4-0 by fitting it with Walschaerts valve gear and a larger superheater. However, this approach would have resulted in excessive axle loading.[3][5] Maunsell’s newly appointed assistants—G.H. Pearson and Harold Holcroft from the Great Western Railway at Swindon, along with James Clayton from the Midland Railway at Derby—had experience designing large passenger tank engines. They convinced Maunsell to adopt the 2-6-4 wheel configuration, which enabled operation at higher speeds on Kent’s poor-quality tracks.[5]

Design and construction

At that time in Britain, the 2-6-4 wheel arrangement was uncommon because many railways operated routes demanding locomotives with larger fuel capacities or short branch lines requiring smaller engines. Prior to this, only one other standard gauge use of this wheel setup existed: the Great Central Railway’s 1914 1B class freight locomotives.[6] Nevertheless, this configuration suited the SECR perfectly due to its relatively short mainlines. It allowed for an extended wheelbase with a leading axle that provided improved stability at speed when negotiating curves. The sharp curves on former LCDR mainlines limited locomotive sizes since these lines had been rapidly constructed in the nineteenth century to rival those of the South Eastern Railway (SER).[6] The longer frame also accommodated a larger boiler than a 4-4-0 design could support, delivering enough power to eliminate frequent double-heading on heavier trains.[7]

The K class featured a leading "Bissel bogie" axle combined with a simple trailing bogie.[8] This trailing bogie allowed for a sizable coal bunker capable of sustaining journeys between London Charing Cross and Template:Stnlnk without refueling. Additionally, side water tanks with a capacity of 2,000 imp gal (9,100 L; 2,400 US gal) were installed, removing the need for a separate tender.[9] To fit the bogie arrangement, the coupled wheelbase between rear and middle driving wheels was shortened from that used on the mechanically similar N class to 7 ft 9 in (2.362 m).[8] The cab was fully enclosed but retained four small front-facing spectacle plate windows identical to those on the N class.[10]

Maunsell’s team designed the K class in 1914 as part of his standardization initiative following the introduction of the N class,[7] though all six designs were presented together to railway directors only in early 1915.[5] The design incorporated power and reliability principles pioneered by George Churchward, including a downward-sloping Belpaire firebox rather than a round-topped one, a regulator housed within the smokebox, long-travel valves allowing efficient high-speed running, a sharply tapered domeless boiler, and right-hand driving controls.[6][7] These features are largely credited to Holcroft, Maunsell’s assistant who had contributed to both the GWR 4300 class and N class designs.[10] Meanwhile, Chief Locomotive Draughtsman James Clayton introduced simpler functional elements influenced by his experience with the Midland Railway, such as the cab shape and drumhead-style smokebox mounted on a wider-diameter saddle beneath the fully lagged boiler.[11] The boiler operated at 200 psi (1.38 MPa), equipped with Ross pop safety valves.[11]

Additional innovations by Maunsell’s design team included an increased superheating surface area, positioning of boiler water top-feed under a dome-like cover with external clackboxes and feed pipes on both sides, Walschaerts valve gear mounted externally, and interchangeable parts shared across similar classes to reduce upkeep costs.[2] The firebox narrowed towards its rear section and had a continuously sloping grate. The ashpan incorporated front and rear damper doors—the rear one adjusted to clear the rear driving axle.[11] At its base, the coal bunker contained an integrated water tank holding 760 imp gal (3,500 L; 910 US gal), connected via rectangular pipes on either side of the locomotive to two side tanks each holding 620 imp gal (2,800 L; 740 US gal). These pipes also served as structural supports for the cab’s footplate.[12]

K class

In January 1915, Maunsell was authorized to construct six units; however, similar to the N class, their production was postponed because the Ashford works were engaged in manufacturing wartime armaments. Assembly commenced in 1917, with the first locomotive, No. 790, completed in July of that year.[13] This engine was stationed at the Bricklayers Arms depot,[14] entering service one month ahead of the earlier N class design.[13] Further production was held back until Ashford could address the maintenance backlog caused by wartime demands.

In June 1920, the SECR placed an order for ten additional locomotives to be built at Ashford works. To accelerate their completion, fabrication of the frames, cylinders, and side tanks was subcontracted to the Royal Arsenal at Woolwich. Nonetheless, significant delays at Ashford due to accumulated repair work meant that the boilers had to be sourced from the North British Locomotive Company.[15] By 1 January 1923, construction of these locomotives had not yet started when the Railways Act 1921 combined the SECR with other southern English railways to form the Southern Railway.[7]

Upon his appointment as CME of the newly created Southern Railway in 1923, Maunsell inherited this outstanding SECR order for ten K class engines. Although most components were already manufactured by 1924, the order remained unfulfilled. On 14 January 1925, Maunsell instructed that No. 790 be overhauled and tested on the Central section.[16] Following its successful performance under these conditions, the Southern Railway's Locomotive Committee authorized completion of the K class using external contractors.[17] Nine sets of parts (Nos. A791–A799) were sent to Armstrong Whitworth for assembly, with finished locomotives delivered in May and June 1925.[8] These engines were equipped with dual braking systems—both vacuum and Westinghouse (air) brakes—to accommodate former London, Brighton and South Coast Railway (LBSCR) rolling stock on the Central section. Compared to the prototype, modifications included relocating the regulator to the dome and enlarging the superheater area.[8] The tenth set of parts remained at Ashford and was later utilized for constructing the initial K1 class locomotive that same year.[18]

In May 1925, Maunsell placed an order for ten more locomotives from Brighton works (Nos. A800–A809), which featured only vacuum brakes suitable for SECR stock operating on the Eastern section.[16] These units arrived between July and December 1926. This batch incorporated revised suspension systems on both the bogie and leading axle to mitigate crew complaints regarding rough riding found in earlier models.[15] Despite strong reservations expressed by the Operating Department about "the wisdom or desirability of placing so many large passenger tanks in service," a further twenty locomotives were ordered in March 1926—ten each from Ashford and Brighton works.[19] Assigned numbers A610–A629, construction had progressed on frames and cylinders before this order was cancelled following a serious incident at Sevenoaks in 1927 involving locomotive No. A800.[19] These numbers were subsequently reassigned to the initial production series of U class locomotives.

K1 class

Side-and-front view of the 3-cylinder version of the locomotive. The distinguishing feature is a full-width flat panel rising vertically above the front buffer beam to the level of the bottom of the smokebox door. The water tanks are a different shape from the K Class, as they include a rectangular access hole in the side, bottom-front, for maintaining the valve gear, which is also different from the K class.
The prototype K1 class No. A890 River Frome, photographed at Bricklayers Arms shed in July 1927. Note the flat cover above the buffers. Above the right-hand cylinder is the Holcroft valve gear linkage to the inside cylinder.

In August 1919, the SECR's Locomotive, Carriage and Wagon Committee considered a proposal for heavy shunting locomotives featuring 2- and 3-cylinder tank engines with a 2-8-0 wheel arrangement.[20] These engines were intended to share the same boiler design as the K and N classes and were generally inspired by layouts employed by the GWR in South Wales.[20] However, this plan did not progress due to other priorities and the subsequent integration of SECR into Southern Railway.[20] In 1922, Holcroft proposed constructing 3-cylinder 2-6-0 tender locomotives with 6 ft (1,830 mm) driving wheels instead of tank engines.[21] Although this design offered extended operational range, Holcroft’s superior Clayton declined to forward this recommendation to Maunsell.[21] Consequently, the 3-cylinder concept was implemented on the K class.[21]

During Southern Railway’s January 1925 Locomotive Committee meeting, while it was agreed that outside contractors would manufacture the K class, Maunsell was authorised to keep one set of components at Ashford works for assembling a prototype 3-cylinder 2-6-4 tank locomotive. This adaptation was modeled on modifications applied to N class No. 822 in 1922 that created a 3-cylinder engine but retained the K class’s 6 ft (1,830 mm) driving wheels and shorter wheelbase.[18] The alteration involved adding an internal cylinder positioned between the frames, with a crank axle installed on the middle driving wheels. A connecting rod inclined at 1 in 8 connected this crank axle to the inside cylinder assembly, allowing clearance over the front driving axle.[22] This setup was complemented by two outside cylinders of smaller diameter—16 in (406 mm) bore compared to 19 in (483 mm) cylinders on the K class—and featured an enlarged chimney diameter.[18] The resulting prototype K1 was narrower than its K class counterpart, enabling operation on routes with tighter loading gauge restrictions.[18] Similar to No. 822, it employed Holcroft’s derivative of Gresley conjugated valve gear to power the inside cylinder.[13] To fit this mechanism, the boiler was elevated by 3 in (76 mm), raising the locomotive’s centre of gravity.[18]

Visually, a key distinction between K and K1 classes appeared at the front: the K1 featured a vertical metal shield above the front buffer beam that protected both the third cylinder and Holcroft valve gear from external elements.[9] The cab was redesigned with single front spectacle plates, and robust steps were installed behind each outside cylinder to facilitate access to the running plate.[23] Unlike K class locomotives, which lacked a middle cylinder allowing a footplate curving smoothly from buffers to water tanks, this design incorporated such features differently. The prototype K1 emerged from Ashford works as No. A890 and underwent trial runs starting 1 December 1925 before entering routine service.[24] Only one unit of this class was constructed; plans for an additional ten locomotives (Nos. A891-A900) alongside five N1 class 2-6-0s were abandoned following the Sevenoaks accident in August 1927.[25] After being rebuilt as a 2-6-0 tender locomotive in 1928, No. A890 was reclassified as U1 and served as a precursor for twenty similar locomotives built in 1931.[26]

K and K1 class construction background

Year Batch[10][23]  Number built   SECR/SR identification numbers Class
 1917  Template:Center Template:Center  790 Template:Center
 1925 Template:Center Template:Center  A791–A799 Template:Center
 1925 Template:Center Template:Center  A890 Template:Center
 1926 Template:Center Template:Center  A800–A809 Template:Center

Locomotive naming

For details of K and K1 class locomotive names, see List of SECR K and SR K1 class locomotives.

The initial K class prototype remained unnamed until 1925, when the Southern Railway's publicity team introduced names for all express passenger engines. Starting with the units built from 1925 onwards, these locomotives were assigned names inspired by rivers located within the Southern Railway's operational region, leading to the collective nickname "River class".[27] The first Southern Railway-built K class engine, No. A791, received the name River Adur, while the original SECR prototype was designated River Avon. Names were also designated for the locomotives planned in the cancelled 1926 production batch.[28] The sole K1 class locomotive, No. A890, carried the name River Frome.[28] These names were showcased on rectangular brass plates affixed to the sides of the water tanks.[8]

Service characteristics

The K class was designed primarily to pull Kent express services for the SECR and underwent testing on routes connecting Charing Cross, Template:Stnlnk, Template:Stnlnk, and Template:Stnlnk.[8] During a non-stop trial journey between Template:Stnlnk and Template:Stnlnk, locomotive No. 790 hauled a train weighing approximately 300 long tons (305 t), which revealed that the side tanks' water capacity was inadequate for such distances without refilling.[21] In spring 1922, No. 790 was also evaluated on fast services between Cannon Street, Template:Stnlnk, and Tonbridge; however, rough riding experienced between Redhill and Tonbridge necessitated reduced speeds on that segment in later operations.[29]

Following the Grouping of 1923, Southern Railway reorganised its motive power allocations, extending the use of this class across its Central section.[8] The Armstrong Whitworth batch equipped with Westinghouse air brakes was assigned to air-braked expresses running between Template:Stnlnk and Template:Stnlnk, as well as regular passenger trains bound for Portsmouth.[8] Meanwhile, the vacuum-braked batch produced at Brighton underwent trials on Portsmouth routes before being deployed on the Redhill–Reading line, frequently hauling the daily through service from Birkenhead to Dover.[8] The single K1 locomotive was predominantly scheduled for hauling the early evening express departing Cannon Street for Dover Marine.[18]

Tank Locomotives' Operational Performance

The K class demonstrated strong performance on well-kept railway lines. It could reach high velocities during express passenger runs; however, its operational range was restricted due to the limited onboard water capacity typical of tank locomotives. This limitation caused the K and K1 classes to experience frequent water shortages on extended Kent Coast routes and prevented their deployment on numerous former London and South Western Railway (LSWR) lines west of London. Weight-saving measures necessitated certain design compromises. Specifically, the boiler dimensions were limited by the SECR's axle load constraints, which meant the locomotive never fully achieved its steaming capabilities. This restriction on boiler size also impacted Maunsell's later 2-6-0 designs, which used the same boiler despite having lower axle loads.

On the Southern Railway’s Central and Eastern divisions, crews often criticized these locomotives for excessive and erratic rolling when operating over the cheaply constructed tracks inherited from the SECR and LBSCR networks, earning them the nickname "Rolling Rivers." The instability was partly caused by the coil suspension system and steadying springs fitted to the Bissel truck and bogie axles, which produced unfavorable springing responses on uneven track surfaces. Although subsequent production batches featured modifications to these components, only marginal improvements were achieved. The rough ride was also linked to the locomotive frames, which had been built with minimal structural reinforcement to reduce weight. This insufficient bracing failed to withstand stresses encountered at speed, resulting in significant vibration on the footplate during higher power output.

The K1 prototype offered slightly greater power and speed than the K class and provided a smoother ride at lower speeds. It also benefited from broader route availability due to its smaller outside cylinders. However, its Holcroft valve gear was complicated to maintain during routine operations. At higher speeds, this locomotive exhibited particularly poor riding qualities and suffered two derailments in 1927. The first incident occurred near Template:Stnlnk, close to Maidstone, on 31 March when the lead coupled wheel flanges climbed over the rails at approximately 60 mph (97 km/h). The second derailment took place at Template:Stnlnk on 20 August, when the lead driving wheel completely left the rails at around 40 mph (64 km/h), causing both train derailment and severe track damage. These accidents were attributed to the slightly elevated center of gravity of the K1’s boiler. While official investigations blamed poor track conditions, some board members pushed for banning both classes from passenger service; however, Southern Railway's Chairman of the Board, Everard Baring, vetoed this proposal citing financial reasons.

Accidents and incidents

  • In March 1927, locomotive No. 890 River Frome was involved in a derailment while pulling a train at Wrotham, Kent.
  • On 2 August 1927, Locomotive No. 800 River Cray experienced a derailment at Maidstone, Kent.
  • Locomotive No. 890 River Frome was hauling a passenger service that derailed at Bearsted, Kent on 20 August 1927. The incident was attributed to defects in the track. After repairs, the locomotive returned to operation on 23 August but was involved in a significant accident the following day.

Sevenoaks disaster

Main article: Sevenoaks railway accident
The locomotive overturned after the Sevenoaks disaster.

The K and K1 classes exhibited stability challenges when negotiating points and curves at high speeds. Initially, the locomotive would roll sharply to one side, followed by several diminishing rolls combined with lateral slipping that caused the driving wheels to climb the rails. After multiple minor derailments involving these classes, the serious derailment of No. A800 River Cray occurred at Sevenoaks, Kent, in August 1927. This was caused by a combination of water tank surging and the leading driving wheels’ flanges climbing the rail due to poor track conditions. The locomotive was hauling an express from Cannon Street to Template:Stnlnk with a Pullman carriage when it derailed at approximately 55 mph (89 km/h) over catch points within a cutting. Several coaches were thrown against a road bridge, resulting in 13 fatalities and 40 injuries.

Following this accident, two locomotives from the K and K1 classes were tested on the London and North Eastern Railway’s (LNER) Great Northern mainline under supervision of CME Nigel Gresley to obtain an impartial evaluation of their running characteristics. In October 1927, locomotives No. A803 (K), No. A890 (K1), and King Arthur class No. E782 were trialled on the well-maintained LNER route between Template:Stnlnk and Template:Stnlnk, where stability issues were minimal. During runs between London King's Cross and Template:Stnlnk using an LNER dynamometer car, No. A890 reached speeds up to 83 miles per hour (134 km/h) and A803 up to 79 miles per hour (127 km/h) without riding problems. Upon their return, Southern Railway’s General Manager Sir Herbert Walker commissioned further evaluations led by Sir John Aspinall on the Western section main line near Template:Stnlnk. These trials were halted by Southern Railway’s Operating Department as the locomotives were deemed unsafe when operating near 80 miles per hour (130 km/h) due to instability. The excessive movement of No. A890 at speed was linked to the use of helical springs on its Bissel truck and bogie.

The inquiry into the 1928 accident did not fault Southern Railway for either track upkeep or locomotive design, noting that the prototype had operated for eight years along the same route without issues. Nevertheless, it identified that the Brighton-built batch and No. A890 were more prone to rolling on tight curves with weak rail joints, though the entire class ran incident-free on former LBSCR lines. Southern Railway management recognized that successful deployment of K class tanks across other network sections would require extensive track improvements. Faced with potentially storing 20 locomotives during these upgrades, management recommended complete withdrawal of the class from service. To recover costs associated with their construction, Maunsell received approval in 1928 to convert them into SR U class 2-6-0 tender engines. This measure also helped mitigate negative publicity following the accident. Additionally, many parts discarded during this rebuilding were later repurposed for another 2-6-4 tank engine designed for heavy freight on short hauls: the three-cylinder SR W class introduced in 1932.

Rebuilding

For an in-depth review of the K and K1 classes after rebuilding, see SR U class and SR U1 class.
View from the side and front of a rebuilt locomotive running solo through a railway station. The engine has a traditional design with a tender, lacking side water tanks that would cover the boiler. Smoke deflectors are installed at the front.
Following reconstruction, the K class was absorbed into the U class. Shown here is one of these rebuilds under British Railways, No. 31803 at Bournemouth. Originally K class No. A803, it bore the name River Itchen.

Converting the class into tender locomotives proved more economical than track relaying, especially since the locomotives had generally performed satisfactorily. The rebuilding process occurred at Ashford, Brighton, and Eastleigh railway works between March and December 1928, involving removal of water tanks, rear bogie, and coal bunker.[30] They were fitted with Maunsell’s straight-sided 3,500-imperial-gallon (15,900 L) tender variant, which extended their operational range.[2] The rear bogies were subsequently repurposed for use on the SR W class 2-6-4 tank engines (the only later adoption of this wheel configuration by Southern Railway, primarily for freight services around London).[9] The sole K1 class locomotive underwent rebuilding in June 1928, becoming the three-cylinder prototype for the SR U1 class.[31] In February 1932, its original Holcroft valve gear was replaced with an additional set of Walschaerts valve gear, simplifying maintenance requirements.[32] None of these rebuilds kept their original names.[27]

Operational performance and retirement of rebuilt locomotives

Once reclassified as members of the U and U1 classes, these locomotives primarily served mixed-traffic roles alongside secondary passenger services on routes connecting principal lines.[33] Their deployment spanned much of the Southern Railway system, though they saw limited use on steep gradients west of Exeter.[33] Crews often favored the smaller-wheeled N class for similar assignments, since high-speed travel was uncommon outside main lines in the West Country. More demanding passenger services were assigned to Bulleid’s Unrebuilt Light Pacifics, which complied with weight limits in these areas.[33] Upon nationalisation in 1948, all 21 rebuilt locomotives entered British Railways’ roster. Beginning in 1955, several received new frames during overhaul; these featured a gentler curve between the front buffer beam and smokebox.[34]

Withdrawals occurred from 1962 through 1966, with many units stationed at Guildford shed by that time.[34] Their duties were gradually taken over by Oliver Bulleid’s Light Pacifics, while widespread electrification of former Southern Railway lines made all 2-6-0 locomotives redundant starting in 1963. The last rebuilt engine was retired in June 1966.[35]

SECR and Southern Railway

The prototype of the K class was finished in an unadorned dark grey shade, featuring white lettering and numbers. This Maunsell grey scheme was initially adopted by the SECR as a cost-saving measure during wartime.[10] Following the 1923 Grouping, the Southern Railway standardized the liveries of its inherited fleets, introducing a uniform sage green paint, a hue previously employed by Urie on the LSWR. This was complemented by black and white lining, primrose yellow numbering, and the word "Southern" displayed on the tender.[36] Beginning in 1925, Maunsell introduced a deeper olive green livery for both K and K1 classes, characterized by simple white lining and primrose yellow markings.[36] After their conversion into U and U1 classes, these locomotives retained the olive green finish with the addition of "Southern" on the tender tank.[37] During World War II, due to workforce shortages, many U class engines were repainted in plain black, resulting in all units operating in black by 1945.[38]

Initially, the class prototype bore the number 790, with subsequent engines numbered sequentially but prefixed with "A" to signify locomotives designed for the former SECR.[10] The Southern Railway adopted this prefix system to differentiate between identical numbers inherited from various companies. The K1 class received number A890 upon construction in 1925.[36] From 1928 onwards, this prefix approach was replaced by a unified renumbering scheme that assigned K class rebuilds numbers from 1790 to 1809,[34] while the K1 rebuild was renumbered as 1890.[39]

Rebuilds in British Railways service

Upon nationalization in 1948, British Railways incorporated the K and K1 classes as part of their U and U1 classifications. In 1950, these were assigned the BR power classification 4MT (mixed traffic).[40] Operational experience with freight duties later led to a reclassification as 4P3F.[41] Initially, the locomotives kept their Southern Railway livery but had "British Railways" added to their tenders when repainted.[41] Between 1949 and 1955, they were progressively repainted into British Railways' mixed-traffic lined black livery featuring red, cream, and grey lining along with the BR crest on the tender.[38] Their numbering was updated to conform with British Railways' standard system: K class rebuilds were numbered from 31790 to 31809, while the K1 class rebuild carried number 31890.[40]

Operational evaluation and conservation

For details on locations and the current condition of preserved (rebuilt) locomotives, see List of SECR K and SR K1 class locomotives.
31806 close to Template:Rws on the Swanage Railway.

Sir Nigel Gresley’s independent analysis of the K and K1 classes during the mainline stability tests concluded that these locomotives were well-engineered, dependable in mechanical terms, and capable of pulling express trains at high velocities on well-maintained rails. This suggested potential value as additions to the Southern Railway's suburban commuter services.[42] Nevertheless, they exhibited a tendency towards unstable and rough riding, an issue not confined solely to inferior track conditions.[18] Their limited water capacity further restricted their deployment beyond the Southern Railway’s Central division. The forthcoming electrification of the Brighton Main Line, planned for 1932, also reduced the availability of routes suitable for heavy passenger tank engines during the 1930s. The absence of an appropriate operational role for both classes influenced the decision to convert them into U/U1 tender locomotives following the Sevenoaks incident.[18] After reconstruction, they remained in service into the 1960s, capable of exceeding speeds over 70 mph (110 km/h) with improved stability.[43]

Only one rebuilt K class locomotive survives: No. A806 River Torridge, transformed into U class No. 1806, was salvaged from the Woodham Brothers scrapyard in Barry, Vale of Glamorgan, South Wales in October 1976 for operation on the Watercress Line.[44] It was restored to its former British Railways appearance as No. 31806.[45] In August 2014, this locomotive commenced service on the Swanage Railway.[46]

See also

Notes

  1. ↑ 1.0 1.1 1.2 Whitehouse & Thomas (2002), p. 49
  2. ↑ 2.0 2.1 2.2 Clarke (February 2008), p. 38
  3. ↑ 3.0 3.1 Whitehouse & Thomas (2002), p. 50
  4. ↑ Whitehouse & Thomas (2002), p. 51
  5. ↑ 5.0 5.1 5.2 5.3 Bradley (1980), pp. 66–67
  6. ↑ 6.0 6.1 6.2 Bradley (1961), p. 52
  7. ↑ 7.0 7.1 7.2 7.3 Middlemass (1990), pp. 148–154
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 Bradley (1961), p. 53
  9. ↑ 9.0 9.1 9.2 Clarke (February 2008), p. 40
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Haresnape (1983), pp. 34–36
  11. ↑ 11.0 11.1 11.2 Rowledge (1976), p. 8
  12. ↑ Rowledge (1976), p. 10
  13. ↑ 13.0 13.1 13.2 Railway Engineer (1923), pp. 140–143
  14. ↑ Bradley (1980), p. 69
  15. ↑ 15.0 15.1 Bradley (1980), p. 70
  16. ↑ 16.0 16.1 Holcroft (1965), pp. 145–147
  17. ↑ Bradley (1980), p. 116
  18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 18.6 18.7 Cite error: Invalid <ref> tag; no text was provided for refs named Bradley2
  19. ↑ 19.0 19.1 Bradley (1980), p. 71
  20. ↑ 20.0 20.1 20.2 Rowledge (1976), p. 7
  21. ↑ 21.0 21.1 21.2 21.3 Holcroft (1965), p. 147
  22. ↑ Rowledge (1976), p. 11
  23. ↑ 23.0 23.1 Haresnape (1983), p. 66
  24. ↑ Reynolds (1943), pp. 155–156
  25. ↑ Rowledge (1976), p. 22
  26. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Bradley2ndp117
  27. ↑ 27.0 27.1 Burridge (1975), p. 48
  28. ↑ 28.0 28.1 Burridge (1975), p. 49
  29. ↑ Rowledge (1976), p. 25
  30. ↑ Scott-Morgan (2002), p. 46
  31. ↑ Rowledge (1976), p. 39
  32. ↑ Clarke (March 2008), p. 56
  33. ↑ 33.0 33.1 33.2 Herring, Section "U Class", pp. 120–121
  34. ↑ 34.0 34.1 34.2 Haresnape (1983), p. 92
  35. ↑ Ian Allan ABC (1966), section: "U class"
  36. ↑ 36.0 36.1 36.2 Swift (2006), p. 50
  37. ↑ Haresnape (1983), p. 88
  38. ↑ 38.0 38.1 Bradley (1961), p. 63
  39. ↑ Haresnape (1983), p. 93
  40. ↑ 40.0 40.1 Ian Allan ABC (1958), section: "U class"
  41. ↑ 41.0 41.1 Longworth: Section "U class"
  42. ↑ Pringle (1928), p. 26
  43. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named steam2
  44. ↑ Great Western Society (2000) Saved from Barry – SR locomotives., Retrieved 21 June 2009
  45. ↑ Langston (2008), p. 112
  46. ↑ Wright, Andrew P. M. (24 June 2014). "Swanage Railway strengthens its fleet with three classic 1920s Southern steam locomotives". Swanage Railway. Archived from the original on 19 April 2016. Retrieved 5 May 2016.

Bibliography

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  • Bradley, D.L. (1980). Locomotives of the South Eastern and Chatham Railway 2nd edition. London: Railway Travel and Correspondence Society.
  • Burridge, Frank (1975). Nameplates of the Big Four. Oxford: Oxford Publishing Company. ISBN 0-902888-43-9.
  • Casserley, H.C.: 'The final days of the Maunsell moguls—the Southern workhorses' (Railway World: 1966, 27), pp. 436–440)
  • Clarke, Jeremy: 'R.E.L. Maunsell locomotives, Part 3: The 'Mogul' series – SECR' (Steam World, 2008 (248)), pp. 38–41
  • Clarke, Jeremy: 'R.E.L. Maunsell locomotives, Part 4: The 'Mogul' series – SR' (Steam World, 2008 (249)), pp. 54–57
  • Earnshaw, Alan (1989). Trains in Trouble: Vol. 5. Penryn: Atlantic Books. ISBN 0-906899-35-4.
  • Gerard, Malcolm; Hamilton, J. A. B. (1981) [1967]. Trains to Nowhere. London: George Allen & Unwin. ISBN 0-04-385084-7.
  • Haresnape, Brian (1977). A Pictorial History of Maunsell Locomotives. Hinckley: Ian Allan. ISBN 0-7110-0743-8.
  • Herring, Peter (2000). Classic British Steam Locomotives. London: Abbeydale Press. ISBN 1-86147-057-6.
  • Holcroft, Harold (1965). A Locomotive Adventure: Fifty Years With Steam 3rd edition. London: Ian Allan.
  • Ian Allan ABC of British Railways Locomotives. London: Ian Allan. 1958–1959.
  • Ian Allan ABC of British Railways Locomotives. London: Ian Allan. 1966–1967.
  • Langston, Keith (2008). A Comprehensive Illustrated Listing of Preserved British Steam Locomotives. Horncastle: Morton's Media Group Ltd.
  • Longworth, Hugh (2005). British Railway Steam Locomotives: 1948–1968. Oxford: Oxford Publishing Company. ISBN 0-86093-593-0.
  • Middlemass, Tom: 'The "Woolworths" — Woolwich Arsenal's cautious foray into mainline locomotive construction' (Backtrack, 1990 (4)), pp. 148–154
  • Pringle, Col. Sir John W. (1928). Railway Accidents: Report on the Derailment of a Passenger Train which occurred on 24 August 1927, near Sevenoaks, on the Southern Railway. London: HMSO.
  • Reynolds, W.J.: 'The Maunsell moguls' (S.R. Railway Magazine, 1943, 89), pp. 155–156
  • Rowledge, Peter (1976). Maunsell Moguls. Blandford Forum: The Oakwood Press.
  • Scott-Morgan, John (2002). Maunsell Locomotives. Hinckley: Ian Allan Publishing. ISBN 0-7110-2872-9.
  • Swift, Peter (2006). Maunsell 4-6-0 King Arthur Class: Detailed Locomotive Analysis volume 4. Hinckley: Ian Allan Publishing. ISBN 0-7110-3086-3.
  • Whitehouse, Thomas, Patrick & David St. John (2002). SR 150: One Hundred and Fifty Years of the Southern Railway. Newton Abbot: David and Charles.

Further reading

  • Fryer, Charles: Railway Monographs No.1: The Rolling Rivers (Sheffield: Platform 5 Publishing, 1993) ISBN 1-872524-39-7
  • Grayer, Jeffery: "Defeating the 'U-Boats'" in Robertson, Kevin (ed.): The Southern Way Issue No.7 (Corhampton: Noodle Books, July 2009), pp. 60–65. ISBN 978-1-906419-17-2
  • Nock, O.S.: Great Locomotives of the Southern Railway (Guild Publishing/Book Club Associates, 1987) pp. 98–102, 115, 132–137, 154–160. CN 5587
  • Robertson, Kevin (ed.): "Earlier Efforts to Scupper the 'U-Boats'" (The Southern Way Issue No.7: Corhampton, Noodle Books, July 2009), pp. 66–67. ISBN 978-1-906419-17-2

External links

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MMetropolitan Railway K ClassCCaledonian Railway 72 ClassGGCR Class 11FGGWR 5600 Class
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