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London & North Western Precursor Tank class
London, Midland & Scottish class 2P
Great Britain | 1906 | 50 produced
No. 528
No. 528

By adding a trailing axle and reducing the driving wheel diameter by six inches, George Whale developed the Precursor tank class from the Precursor class tender locomotive. It was intended to pull heavy passenger trains on branch lines, but had an axle load that was too high for many branch lines. A total of 50 locomotives were built, the last 20 of which had smaller wheels.

Not only were the cylinders between the frames, but also the leading sandbox. For this reason, the latter was very difficult to refill, which is why a separate filler neck had to be attached to the outside. Since the locomotives could no longer be adapted to growing requirements due to their wheel arrangement, they were all retired between 1927 and 1940.

General
Built1906-1909
ManufacturerCrewe
Axle config4-4-2T (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase32 ft 7 1/2 in
Fixed wheelbase10 ft
Service weight168,000 lbs
Adhesive weight89,600 lbs
Axle load44,800 lbs
Water capacity2,042 us gal
Fuel capacitycoal
Power
Power sourcesteam
Estimated power900 hp (671 kW)
Optimal speed31 mph
Starting effort18,616 lbf
Power Plant
Driver diameter75 in
Boiler pressure175 psi
Expansion typesimple
Cylinderstwo, 19 x 26 in
Boiler
Grate area22.4 sq ft
Firebox area161.3 sq ft
Tube heating area1,848.4 sq ft
Evaporative heating area2,009.7 sq ft
Total heating area2,009.7 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
George Whale
last changed: 03/2024
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