The reference for locomotives and railcars


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London & North Western 19in Express Goods class
“Experiment Goods Class” (London, Midland & Scottish class 4F)
Great Britain | 1906 | 170 produced
No. 285
No. 285

By reducing the driving wheel diameter from 75 to 62.5 inches, George Whale, superintendent at the LNWR, developed a locomotive for mixed service from his Experiment class. The resulting class reached a total of 170 and was officially referred to as “19in Express Goods,” a reference to the cylinder diameter and its primary intended use in front of express goods trains.

Because of their origin they were also called the “Experiment Goods Class”. They were classified by the LMS into power class 4F and were withdrawn from service from 1931. British Railways only took over three locomotives, which disappeared by 1950.

Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase26 ft 8 1/2 in
Fixed wheelbase13 ft 7 in
Service weight141,120 lbs
Adhesive weight98,560 lbs
Total weight224,000 lbs
Axle load35,840 lbs
Water capacity3,603 us gal
Fuel capacity13,440 lbs (coal)
Power sourcesteam
Estimated power900 hp (671 kW)
Optimal speed24 mph
Starting effort23,615 lbf
Power Plant
Driver diameter62.5 in
Boiler pressure185 psi
Expansion typesimple
Cylinderstwo, 19 x 26 in
Grate area25 sq ft
Firebox area144.3 sq ft
Tube heating area1,840.7 sq ft
Evaporative heating area1,985 sq ft
Total heating area1,985 sq ft
Calculated Values
steam locomotive
last changed: 03/2024

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