The reference for locomotives and railcars


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United Swiss Railways B 3/4
originally A3T
Switzerland | 1890 | 15 produced
No. 102
No. 102

The first compound locomotives that the VSB procured were ten express locomotives from the years 1890 to 1897. They had the wheel arrangement 2-6-0 and were designated by the VSB as A3T, but are better known under their later SBB designation B 3/4.

After the first batch of ten locomotives, five more were built from 1900. Not only were the cylinders larger, but they also received a new boiler. This had higher pressure and a larger firebox at the expense of the tube heating surface. The first series was phased out between 1913 and 1924, the last disappeared in 1929.

Variant1890 variant1900 variant
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length43 ft 10 3/4 in
Wheelbase19 ft 8 1/4 in
Fixed wheelbase11 ft 6 9/16 in
Total weight164,465 lbs
Axle load27,999 lbs28,219 lbs
Water capacity2,536 us gal2,800 us gal
Fuel capacity8,818 lbs (coal)
Power sourcesteam
Indicated power691 hp (515 kW)
Optimal speed35 mph29 mph
Top speed47 mph
Starting effort12,700 lbf14,958 lbf
with start valve15,240 lbf17,950 lbf
Power Plant
Driver diameter62.6 in
Boiler pressure174 psi188 psi
Expansion typecompound
Cylinderstwo, HP: 17 11/16 x 25 9/16 in
and LP: 25 3/16 x 25 9/16 in
two, HP: 18 5/16 x 25 9/16 in
and LP: 26 3/4 x 25 9/16 in
Grate area18.3 sq ft20.5 sq ft
Firebox area82.9 sq ft99 sq ft
Tube heating area1,409 sq ft1,324 sq ft
Evaporative heating area1,491.9 sq ft1,423 sq ft
Total heating area1,491.9 sq ft1,423 sq ft
Calculated Values
steam locomotive
last changed: 03/2023

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