The reference for locomotives and railcars


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North-East Railway A 2/4
Swiss Federal Railways A 2/4
Switzerland | 1898 | 50 produced
No. 190 in the SLM type sheet
No. 190 in the SLM type sheet
SBB Historic

Starting in 1898, the Swiss North Eastern Railway got 25 4-4-0 express locomotives from the SLM. They were called A 2/4 and were two-cylinder compounds. Being the only inside-cylinder locomotives of the NOB, their designers hoped to get smoother running characteristics. The Walschaerts valve gear was located on the outside.

On flat lines, they were usually used in trains of 300 to 600 tonnes and 200 to 240 tonnes on 1.2 percent. After the NOB became part of the SBB in 1902, the SBB ordered 25 more. The newer locomotives had a steam and a sand dome, while the earlier ones didn't have any domes. Only the three oldest were retired in 1917, all others followed in 1925.

Variant1898 variant1903 variant
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length51 ft 10 13/16 in
Wheelbase23 ft 7 7/16 in
Fixed wheelbase8 ft 6 3/8 in
Empty weight60,186 lbs64,375 lbs
Adhesive weight69,886 lbs74,516 lbs
Total weight179,236 lbs186,290 lbs
Water capacity3,170 us gal3,646 us gal
Fuel capacity13,228 lbs (coal)
Power sourcesteam
Estimated power738 hp (550 kW)
Optimal speed36 mph
Starting effort13,002 lbf
with start valve15,602 lbf
Power Plant
Driver diameter72 in
Boiler pressure188 psi
Expansion typecompound
Cylinderstwo, HP: 18 1/8 x 26 in
and LP: 26 3/4 x 26 in
Grate area23.7 sq ft
Firebox area113 sq ft
Tube heating area1,384.2 sq ft
Evaporative heating area1,497.3 sq ft
Total heating area1,497.3 sq ft
Calculated Values
steam locomotive
last changed: 06/2024

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