Queensland C16 class locomotive
| Company type | Steam locomotive class |
|---|---|
| Industry | Railway transport |
| Founded | 1903 |
| Headquarters | Queensland , Australia |
| Products | Steam locomotives |
The Queensland Railways C16 class comprises a series of 152 4-8-0 steam locomotives constructed between 1903 and 1918. These engines were produced by four prominent Australian manufacturers: Evans, Anderson, Phelan & Co, North Ipswich Railway Workshops, Toowoomba Foundry, and Walkers Limited, playing a significant role in Queensland Railways' operations.
Fueled by coal with an 8 LT capacity and equipped with water tanks holding 3000 imperial gallons, the C16 class operated at a boiler pressure of 175 psi. They featured two outside cylinders measuring 16 inches in diameter by 22 inches in stroke. Their sturdy configuration included driving wheels with a diameter of 45 inches and an overall weight, including the tender, of about 80.5 LT.
These locomotives were predominantly assigned to Queensland’s narrow-gauge lines, where they were vital for both freight and passenger transport during their prime years of service. The scope and engineering of the class highlight Queensland Railways’ deliberate commitment to adaptable steam power to facilitate regional economic development in the early 1900s.
Construction
Within Queensland Railways' classification system, the designation C16 denotes "C" for four driving axles and "16" representing the cylinder diameter in inches. The first unit, No. 395, marked the inaugural locomotive built at the newly established North Ipswich Railway Workshops and was distinctive for incorporating a screw reverser—a feature not found on Garratt types. After successful testing, a subsequent order for twenty additional units was placed in March 1906. Initial batches carried a combined builder’s plate and number on the cab sides. To differentiate from the earlier C16 Baldwin class, this series was initially referred to as the Ipswich C16 class. Most locomotives were painted black when assigned to livestock trains; however, three were uniquely finished in brown, blue, and green to operate the heavy Sydney Mail service to Wallangarra until larger engines superseded them. Beginning around 1910, newly built locomotives often reused numbers from withdrawn units along with their brass number plates.
Superheating trial
During the 1920s, experiments with superheating were conducted on ten locomotives aiming to enhance coal and water consumption efficiency. Nevertheless, elevated temperatures led to lubrication difficulties with slide valves, resulting in increased wear and steam leakage. Attempts to replace cast iron valves with bronze offered minimal benefits. By 1929, the practice of superheating slide valve engines was discontinued; those previously modified reverted to saturated steam configurations during boiler replacements. Between 1942 and 1944, eleven units were temporarily transferred to Commonwealth Railways for operation on the Central Australia Railway under numbers NMB55 through NMB65. As the Queensland C17 Class took over primary responsibilities, remaining C16 locomotives mainly served heavy shunting tasks at yards such as Rockhampton where PB15 class engines lacked sufficient power.
Modifications
Throughout their operational life, this class underwent multiple alterations. Early models had sandboxes mounted on the running boards, which were later standardized to a Baldwin-type sandbox positioned on the boiler for all but the first locomotive. Starting in 1945, most surviving engines—except No. 106—were upgraded with Association of American Railroads Master Mechanics smokeboxes that considerably improved functionality. These upgraded units can be recognized by their tapered stove pipe chimneys.
Preservation
Only one example remains intact. Originally displayed at the Redbank Locomotive Museum, No. 106 was transferred to the DownsSteam Tourist Railway & Museum in October 2001, where its restoration reached completion in 2021.