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Great Western Railway class 3150 “Large Prairie”
Great Britain | 1906 | 41 produced
One example is parked in the Gloucester depot in 1948, when it was only used as a pusher locomotive
One example is parked in the Gloucester depot in 1948, when it was only used as a pusher locomotive
Ben Brooksbank / A '3150' 2-6-2T at Gloucester GW Locomotive Depot

Based on the Prairie locomotives later known as the class 3100 and class 5100, the GWR had 41 units of a reinforced variant made as the Class 3150 in 1906. The standard type 2 boiler was replaced with a larger type 4 boiler, which was mounted slightly higher here. Due to the higher weight, the axle load was assigned to the “Red” category instead of “Blue”, which reduced the area of use of the locomotives compared to their predecessors. However, the main suburban routes were string enough to allow the use of these locomotives. So they pulled the heavy local trains on these routes. The machines were retired between 1957 and 1960.

As early as 1938, the then chief engineer Charles Benjamin Collett had started a rebuilding program of five engines, which were to be used for pushing on ramps. These reduced the coupling wheel diameter by five inches to 1,600 mm, increased the boiler pressure from 200 to 225 psi and increased the cylinder diameter by half an inch. This increased the tractive effort by more than 20 percent. These machines were known as the Collett class 3100, but the number remained as five.

Axle config2-6-2T (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length41 ft 0 in
Wheelbase31 ft 9 in
Fixed wheelbase14 ft 9 in
Empty weight144,800 lbs
Service weight182,800 lbs
Water capacity2,402 us gal
Fuel capacity10,080 lbs (coal)
Power sourcesteam
Estimated power1,050 hp (783 kW)
Optimal speed26 mph
Starting effort25,669 lbf
Power Plant
Driver diameter68 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 30 in
Grate area20.6 sq ft
Firebox area129 sq ft
Tube heating area1,349 sq ft
Evaporative heating area1,478 sq ft
Superheater area192 sq ft
Total heating area1,670 sq ft
Calculated Values
steam locomotive
tank locomotive
George Jackson Churchward
last changed: 02/2022

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