| Bavarian S 2/5 DRG Class 14.1 |
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|---|---|
| Number(s): | DRG 14 141–145 |
| Quantity: | 10 |
| Manufacturer: | Maffei |
| Year(s) of manufacture: | 1904 |
| Retired: | 1927 |
| Wheel arrangement: | 4-4-2 |
| Axle arrangement: | 2'B1' n4v |
| Gauge: | 1,435 mm |
| Length over buffers: | 19,275 mm |
| Service weight: | 68.6 t |
| Adhesive weight: | 32.0 t |
| Axle load: | 16.0 t |
| Top speed: | 110 km/h |
| Driving wheel diameter: | 2,000 mm |
| Leading wheel diameter: | 950 mm |
| Trailing wheel diameter: | 1,206 mm |
| No. of cylinders: | 4 |
| LP cylinder bore: | 570 mm |
| HP cylinder bore: | 340 mm |
| Piston stroke: | 640 mm |
| Boiler Overpressure: | 16 bar |
| Grate area: | 3.27 m² |
| Evaporative heating area: | 205.50 m² |
| Tender: | Bavarian 2'2' T 21 |
| Water capacity: | 21.0 m³ |
The Class S 2/5 steam locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staats-Eisenbahnen) were the first steam engines in Germany to be built with full locomotive frames (durchgehendem Barrenrahmen). The prototypes for this type of frame were the two locomotives imported in 1900 from Baldwin Locomotive Works in the USA, that had been similarly classified as the S 2/5.
Maffei built ten machines in 1904 that shared many of the same components as the S 3/5, which was developed in parallel. For the first time in Bavaria a driving wheel diameter of 2,000 mm was chosen instead of the 1,870 mm diameter hitherto the norm for express train locomotives. Like the locomotives imported from the USA, they had a four-cylinder compound engine. However the usual European configuration with two inside and two outside cylinders was used instead of the Vauclain compound system.
On test runs, one of the locomotives reached 135 km/h; in normal use, 110 km/h was the top speed. The locomotives were initially stabled at Munich I shed and hauled such famous trains as the Orient Express and the North-South Express, amongst others. But, as on all German Atlantics the traction of the two driven axles was soon insufficient. The S 2/5 was not endowed with a long time in service, although the locomotive had very good riding qualities.
In 1910 the locomotives went across to the Palatine network to Ludwigshafen shed and also to the Nuremberg repair shop. In 1922 only eight S 2/5 engines remained. The Deutsche Reichsbahn took over just five locomotives as the Class 14.1, numbered 14 141–145. They were retired in 1927.
The locomotives had Bavarian 2'2' T 21 tenders.
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