FS Class 600
| Company type | State-owned company |
|---|---|
| Industry | Rail transport |
| Founded | 1905 |
| Headquarters | Rome , Italy |
Area served | Italy |
The Class 600 steam locomotives of the Ferrovie dello Stato Italiane (FS; Italian State Railways), previously known as Class 380 under both the Rete Adriatica and the Società per le Strade Ferrate Meridionali, represent a 2-6-0 'Mogul' type engine. This series is often recognized as one of Italy's earliest examples of a modern steam locomotive design.
Design and construction
Engineered in Florence for the Rete Adriatica network by designers including Enrico Plancher and Giuseppe Zara, the Class 600 was developed to handle both passenger and freight services on Italy’s challenging routes characterized by steep gradients and tight curves, while maintaining efficient speeds. A significant innovation introduced with this class was the adoption of the Italian bogie—a modification derived from the German Krauss-Helmholtz bogie—crafted to optimize curve navigation without employing a four-wheel bogie. This design proved highly effective and became a defining feature in subsequent Italian steam locomotives.
Another distinctive aspect was the integration of the Walschaerts valve gear operating a compound engine with internal cylinders paired with externally mounted piston valves. This configuration was later utilized in other FS locomotive classes such as the FS Class 630 and FS Class 745.
The initial batch of fifty units featured boilers capable of delivering approximately 660 hp (490 kW), whereas later models were equipped with larger boilers that increased output to around 730 hp (540 kW); some earlier units were subsequently upgraded to match this enhanced performance.
Locomotives were originally allocated to RA and SFM ('Strade Ferrate Meridionali') entities before their absorption into FS in 1905 and 1906 respectively, with two additional units built for the Valsugana valley railway joining FS in 1912. In total, production reached 248 locomotives constructed between 1904 and 1908, all paired with a standardized six-wheeled tender.
Service and modifications
The Class 600 demonstrated considerable success during its operational tenure and served as a foundation for the development of its simple-expansion and superheated successors, notably the Class 625 series.
In 1927, locomotive number 600.168 underwent a rebuild that involved fitting it with a superheated boiler from the Class 625, leading to its reclassification as 601.168. Despite this trial, further conversions of this type were not pursued. Instead, from 1929 onwards, a decision was made to convert the existing units directly to Class 625 specifications. By 1933, a total of 153 locomotives had been transformed into 625.3XX models.
Locomotives of the Class 600 that were not subjected to these upgrades were systematically retired prior to 1940.