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The reference for locomotives and railcars

Great Western Railway class 3800 “County”

Great Britain 1904 40 produced
No. 3818 “County of Radnor” The Boys' Book of Locomotives von J.R. Howden PD

At the turn of the century the GWR needed powerful express locomotives for the Shrewsbury and Hereford line, where no six-coupled locomotives were allowed. So Churchward designed the County class as a 4-4-0 derivative of the 4-6-0 Saint class. They were the last new 4-4-0 locomotives of the GWR and the first ten built in 1904 got the numbers 3473 to 3482.

Like the Saint, they had outside cylinders whose size was not changed. Since these big cylinders needed heavy counterweights which now had to be divided between only four wheels, this led to a heavy hammer blow induced in the tracks. Another effect of the big cylinders was that the tractive force was a bit too high for two coupled axles. 

Until 1912, a total of 40 had been built, of which the last ten got a superheated boiler from the start. After the second batch had already got numbers starting with 3801, in 1912 they were renumbered 3800 to 3839. A development of the County class was the class 2221 “County Tank” that got the same cylinder dimensions, but a smaller boiler.

Possibly due to their rough riding, they were withdrawn between 1930 and 1933. All were scrapped, but the Churchward County Trust announced that they would build No. 3840 “County of Montgomery” new from scratch. In May 2024 they machined the front part of the frames.

Technical data

General

Property as built superheated
Built 1904-1912
Manufacturers Swindon
Wheel arrangement 4-4-0 (American)
Gauge 1,435 mm (Standard gauge)

Dimensions and weights

Property as built superheated
Wheelbase 7.32 m
Service mass 58.4 t 59.7 t
Adhesion mass 37.6 t 40.6 t
Total mass 99.1 t 100.4 t
Rigid wheelbase 2.59 m
Axle load 19.1 t 19.4 t
Water capacity 15,910 l

Boiler

Property as built superheated
Grate area 1.905 m² 1.91 m²
Firebox surface 11.919 m² 11.958 m²
Tube heating surface 156.978 m² 125.352 m²
Evaporative heating surface 168.898 m² 137.311 m²
Total heating surface 168.9 m² 155.1 m²
Superheater surface 17.837 m²

Power plant

Property as built superheated
Driver diameter 2,045 mm
Boiler pressure 13.8 bar
Expansion type simple expansion
Cylinders two, 457 x 762 mm

Power

Property as built superheated
Power source steam
Estimated power 671 kW (912 PS) 783 kW (1,065 PS)
Starting effort 91.3 kN

Calculated values

Property as built superheated
Factor of adhesion 1 : 4.04 1 : 4.37
Optimal speed 45 km/h 53 km/h
Power-to-weight ratio 11.5 kW/t 13.1 kW/t
Heating Surface Equivalent 228.5 m² 232.8 m²
Cylinder volume/HSE 1 : 1,095.01 1 : 1,074.86
Adhesive weight/Total 1 : 1.55 1 : 1.47
Tractive force/Heating surface 1 : 11.29 1 : 12.29
Grate area/Heating surface 1 : 88.66 1 : 81.23
Firebox/Tube surface 1 : 13.17 1 : 10.48
Total/Superheater 1 : 7.70
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