The reference for locomotives and railcars


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Bavarian S 2/5 (Vauclain)
Germany | 1900 | 2 produced
No. 2399
No. 2399
works photo Baldwin

In order to gain experience with steam locomotive designs from the USA, the Bavarian State Railways ordered four locomotives from Baldwin in 1899 and 1900. These were the two type E I Consolidations and the two type S 2/5 Atlantics. What both had in common was the four-cylinder Vauclain compound engine and the bar frame. The S 2/5 was based on the Milwaukee Road class A-1, but to save weight the drivers were made smaller by six inches.

The special feature of the Vauclain drive was that all four cylinders were outside the frame and were easily accessible. Although this design did not become established in Europe, the Bavarian State Railway adopted the bar frame for all later four-cylinder locomotives. This made maintenance of the cylinders located within the frame easier. The bar frame was later also used on the standard locomotives of the Reichsbahn, even though in principle only a few southern German influences were allowed on these. The two S 2/5 remained in service between Munich and Salzburg for more than 20 years, but were decommissioned in 1923 and were therefore no longer renumbered as Reichsbahn class 14.

Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length61 ft 5 1/4 in
Wheelbase25 ft 5 1/8 in
Fixed wheelbase6 ft 9 1/8 in
Service weight138,450 lbs
Adhesive weight67,902 lbs
Axle load33,951 lbs
Water capacity5,548 us gal
Fuel capacitycoal
Power sourcesteam
Estimated power939 hp (700 kW)
Optimal speed38 mph
Top speed56 mph
Starting effort15,618 lbf
with start valve18,742 lbf
Power Plant
Driver diameter72 in
Boiler pressure203 psi
Expansion typecompound
Cylindersfour, HP: 13 x 26 in
and LP: 22 x 26 in
Grate area30.2 sq ft
Evaporative heating area2,000 sq ft
Total heating area2,000 sq ft
Calculated Values
steam locomotive
Vauclain compound
last changed: 12/2023

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