The reference for locomotives and railcars


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Prussian S 2
Germany | 1890 | 170 produced
Erfurt type
Erfurt type
„Die Lokomotive”, August 1910
VariantHanover typeErfurt typeErfurt type (compound)
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length50 ft 5 1/2 in51 ft 2 3/4 in
Service weight99,649 lbs107,365 lbs
Adhesive weight61,729 lbs63,273 lbs
Total weight187,834 lbs
Axle load30,865 lbs31,636 lbs
Water capacity2,774 us gal3,963 us gal
Fuel capacity8,818 lbs (coal)11,023 lbs (coal)
Power sourcesteam
Estimated power536 hp (400 kW)603 hp (450 kW)
Optimal speed36 mph30 mph44 mph
Top speed62 mph
Starting effort9,607 lbf12,976 lbf8,835 lbf
with start valve11,528 lbf10,602 lbf
Power Plant
Driver diameter77.2 in
Boiler pressure174 psi
Expansion typecompoundsimplecompound
Cylinderstwo, HP: 17 11/16 x 23 5/8 in
and LP: 25 9/16 x 23 5/8 in
two, 16 15/16 x 23 5/8 intwo, HP: 17 5/16 x 23 5/8 in
and LP: 23 5/8 x 23 5/8 in
Grate area22.3 sq ft24.4 sq ft
Firebox area98 sq ft
Tube heating area1,345.5 sq ft
Evaporative heating area1,219 sq ft1,443.4 sq ft
Total heating area1,219 sq ft1,443.4 sq ft
Calculated Values
steam locomotive
last changed: 08 2023

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