The reference for locomotives and railcars
Great Eastern class M15
London & North Eastern classes F4 and F5
Great Britain | 1884 | 160 produced
No. 7071 at Stratford
No. 7071 at Stratford
Locomotive Magazine, February 1913

Between 1884 and 1886 Worsdell had 40 tank locomotives built for passenger service, which had Joy valve gear. Holden made 120 more between 1903 and 1909, which received Stephenson valve gear for lower fuel consumption. Many were fitted with a condensing gear for London traffic. From 1911 rebuilds to the M15R with a new boiler took place. At the LNER, the unrebuilt locomotives became the class F4 and the rebuilt ones became the F5. The first locomotives had already been retired from 1913, but some F4s remained in service until 1956. In 1949, seven F5s were still equipped with push-pull apparatus. The F5 was only phased out between 1955 and 1958.

Variant1884 variant1903 variantrebuilt M15R
Axle config2-4-2T (Columbia) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length34 ft 10 in
Wheelbase23 ft
Fixed wheelbase23 ft
Service weight116,284 lbs115,544 lbs120,848 lbs
Adhesive weight65,268 lbs59,556 lbs
Axle load35,056 lbs33,348 lbs
Water capacity1,441 us gal
Fuel capacity5,040 lbs (coal)
Power sourcesteam
Estimated power425 hp (317 kW)500 hp (373 kW)525 hp (391 kW)
Optimal speed17 mph20 mph19 mph
Starting effort15,619 lbf17,571 lbf
Power Plant
Driver diameter64 in
Boiler pressure160 psi180 psi
Expansion typesimple
Cylinderstwo, 17 1/2 x 24 in
Grate area15.4 sq ft15.3 sq ft
Firebox area98.4 sq ft96.7 sq ft
Tube heating area955.6 sq ft1,034.6 sq ft1,018 sq ft
Evaporative heating area1,054 sq ft1,133 sq ft1,114.7 sq ft
Total heating area1,054 sq ft1,133 sq ft1,114.7 sq ft
Calculated Values
steam locomotive
tank locomotive
Thomas William Worsdell
James Holden
last changed: 03/2023

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