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Great Western Railway class 4575 “Small Prairie”
Great Britain | 1927 | 100 produced
No. 5515 in March 1948 shortly after the formation of British Railways, still with GWR lettering
No. 5515 in March 1948 shortly after the formation of British Railways, still with GWR lettering
Ben Brooksbank / A 'Small Prairie' 2-6-2T at Gloucester GW Locomotive Depot

From 1927, the then chief engineer of the GWR, Charles Collett, procured 100 pieces of an improved version of the Class 4500 developed by Churchward. The most important difference concerned larger water tanks, which could be visually recognized by the sloping top at the front. Since the company numbers of the first series followed the 75 units of class 4500 without gaps, they became class 4575. The total of 100 units were initially assigned numbers up to 4599 and finally from 5500 to 5574.

Although these locomotives were built later than their predecessors, they remained in service little longer. Their retirement began in April 1956 and was completed in December 1964. A total of eleven pieces still exist today. The number 5521 even came to Poland from 2007 to take part in the annual parade of the museum in Wolsztyn. After that it spent some time in Hungary to pull the Orient Express and after another stay in Poland to come back to England.

General
Built1927-1929
ManufacturerSwindon
Axle config2-6-2T (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length36 ft 4 1/2 in
Wheelbase26 ft 10 in
Fixed wheelbase11 ft 7 in
Service weight136,635 lbs
Adhesive weight103,595 lbs
Axle load34,830 lbs
Water capacity1,300 us gal
Fuel capacity8,288 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)
Optimal speed26 mph
Starting effort21,245 lbf
Power Plant
Driver diameter55.5 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 17 x 24 in
Boiler
Grate area16.5 sq ft
Firebox area94 sq ft
Tube heating area992.5 sq ft
Evaporative heating area1,086.5 sq ft
Superheater area70 sq ft
Total heating area1,156.5 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
Charles Benjamin Collett
last changed: 02/2022
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