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The reference for locomotives and railcars

Great Western Railway class 1000 “County”

Great Britain 1945 30 produced
No. 1000 “County of Middlesex” in August 1958 at Bristol Depot Ben Brooksbank / First Hawksworth „County” 4-6-0 at Bristol Bath Road Depot CC BY-SA 2.0

The County class of the GWR was developed by Hawksworth during World War II and was intended for mixed service. It was the last of a series of ten-wheelers begun by Churchward in 1902 with the Saint class. It included some innovations such as 280 psi boiler pressure and dual chimneys. However, the pressure was later reduced to 250 psi to save on maintenance costs, and later examples had single chimneys. Special optical features for GWR locomotives were the continuous splashers over all driving axles and straight nameplates.

After two batches and 30 locomotives, production was discontinued as the staff evidently preferred the locomotives from Hawksworth's predecessor, Collett, and there was no need for more. The County class was retired between 1962 and 1964. Although not a single locomotive has survived, number 1014 “County of Glamorgan” is currently being built new.

Technical data

General

Property as built reduced boiler pressure
Built 1945-1947
Manufacturers Swindon
Wheel arrangement 4-6-0 (Ten-wheeler)
Gauge 1,435 mm (Standard gauge)

Dimensions and weights

Property as built reduced boiler pressure
Length 19.21 m
Wheelbase 8.31 m
Service mass 78.1 t
Adhesion mass 60 t
Total mass 127.9 t
Rigid wheelbase 4.50 m
Axle load 20 t
Water capacity 18,185 l
Fuel capacity 7.1 t (coal)

Boiler

Property as built reduced boiler pressure
Grate area 2.679 m²
Firebox surface 15.701 m²
Tube heating surface 143.535 m²
Evaporative heating surface 159.236 m²
Superheater surface 23.597 m²
Total heating surface 182.8 m²

Power plant

Property as built reduced boiler pressure
Driver diameter 1,905 mm
Boiler pressure 19.3 bar 17.2 bar
Expansion type simple expansion
Cylinders two, 470 x 762 mm

Power

Property as built reduced boiler pressure
Power source steam
Estimated power 1,715 kW (2,332 PS) 1,603 kW (2,179 PS)
Starting effort 144.9 kN 129.4 kN

Calculated values

Property as built reduced boiler pressure
Factor of adhesion 1 : 4.06 1 : 4.55
Optimal speed 72 km/h 76 km/h
Power-to-weight ratio 22.0 kW/t 20.5 kW/t
Heating Surface Equivalent 284.9 m²
Cylinder volume/HSE 1 : 927.56
Adhesive weight/Total 1 : 1.30
Tractive force/Heating surface 1 : 16.56 1 : 14.78
Grate area/Heating surface 1 : 68.25
Firebox/Tube surface 1 : 9.14
Total/Superheater 1 : 6.75
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