The reference for locomotives and railcars


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Great Southern & Western class 400
Irish Transport Company class B2
Ireland | 1916 | 10 produced
Photo from an Armstrong-Whitworth catalog
Photo from an Armstrong-Whitworth catalog

After Edward A. Watson became acquainted with the Star class at the GWR, he designed the class 400 for the Great Southern & Western based on it. Similarities included, above all, the 4-6-0 wheel arrangement and the four cylinders with simple expansion. In 1916 only the prototype with the number 400 was initially built in Inchicore. Its problem was that the frames were too thin and there were inadequate bolsters for the steam pipes, which often led to them breaking. In addition, the consumption of water and coal was too high.

From 1921 onwards, further locomotives were built, which received some improvements. Together with others from Armstrong Whitworth, the number rose to ten. However, since these were not entirely convincing, the seven remaining locomotives were rebuilt between 1927 and 1937 with two larger cylinders. Some were almost completely rebuilt, while the changes to others were limited. In this form they were successful, so that the last one was used until 1961.

Built1916, 1921-1923
ManufacturerInchicore, Armstrong Whitworth
Axle config4-6-0 (Ten-wheeler) 
Gauge5 ft 3 in (Irish broad gauge)
Dimensions and Weights
Wheelbase27 ft 1 in
Fixed wheelbase15 ft 3 in
Total wheelbase49 ft 4 in
Service weight158,368 lbs
Adhesive weight113,568 lbs
Total weight239,680 lbs
Axle load38,752 lbs
Water capacity4,017 us gal
Fuel capacity15,680 lbs (coal)
Power sourcesteam
Estimated power1,200 hp (895 kW)
Optimal speed40 mph
Starting effort19,191 lbf
Power Plant
Driver diameter79 in
Boiler pressure175 psi
Expansion typesimple
Cylindersfour, 14 x 26 in
Grate area28 sq ft
Firebox area158 sq ft
Tube heating area1,614 sq ft
Evaporative heating area1,772 sq ft
Superheater area440 sq ft
Total heating area2,212 sq ft
Calculated Values
steam locomotive
last changed: 02/2024

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