The reference for locomotives and railcars
London & South Western class 415 “Radial Tanks”
Great Britain | 1882 | 71 produced
flickr/Historical Railway Images

For the suburban lines in London, William Adams provided his class 46, which had outside cylinders, with an additional trailing axle in order to be able to accommodate larger coal supplies. Since this axle was in a radial axle box, the locomotive was nicknamed the “Radial Tank”. Four manufacturers delivered a total of 71 locomotives, the last of which had a boiler pressure of 160 instead of 140 psi. As early as 1895, the locomotives were replaced by other locomotives in their original area of operation, after which they were relocated to branch lines in rural areas. After the first were retired in 1916, the largest number only disappeared between 1923 and 1928 under the Southern Railway. Three locomotives even survived on the Lyme Regis branch until 1961, because initially no other suitable locomotives were found for the tight curves. One of these today belongs to the Bluebell Railway but is not operational.

Variantfirst batcheslast batches
ManufacturerRobert Stephenson & Co., Dübs & Co., Neilson & Co., Beyer, Peackock & Co.
Axle config4-4-2T (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length36 ft 5 1/2 in
Wheelbase29 ft 5 in
Fixed wheelbase8 ft 6 in
Service weight125,664 lbs
Adhesive weight69,440 lbs
Axle load34,720 lbs
Water capacity1,441 us gal
Fuel capacity2,240 lbs (coal)
Power sourcesteam
Estimated power525 hp (391 kW)560 hp (418 kW)
Optimal speed26 mph24 mph
Starting effort13,054 lbf14,919 lbf
Power Plant
Driver diameter67 in
Boiler pressure140 psi160 psi
Expansion typesimple
Cylinderstwo, 17 1/2 x 24 in
Grate area18.1 sq ft
Firebox area111 sq ft
Tube heating area945 sq ft
Evaporative heating area1,056 sq ft
Total heating area1,056 sq ft
Calculated Values
steam locomotive
tank locomotive
Willian Adams
last changed: 08/2023

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