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GWR 6400 and 7400 Classes
6417 at Aberdare (Low Level)
Type and origin
Power type
Steam
Designer
Charles Collett
Builder
GWR/BR Swindon Works
Order number
6400: Lots 277 (part), 294, 300, 305
7400: 307, 371, 380
Build date
6400: 1932 (40)
7400: 1936 (30), 1948 (10), 1950 (10)
Total produced
6400: 40
7400: 50
Specifications
Configuration:
• Whyte
0-6-0PT
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.
4 ft 7+1⁄2 in (1.410 m)
Length
31 ft 1 in (9.474 m)
Width
8 ft 7 in (2.616 m)
Height
12 ft 2+15⁄16 in (3.732 m)
Loco weight
6400: 45.6 long tons (46.3 t; 51.1 short tons)
7400: 45.45 long tons (46.18 t; 50.90 short tons)
Fuel type
Coal
Fuel capacity
3 long tons 18 cwt (8,700 lb or 4 t) (3.2 short tons)
Water cap.
1,100 imp gal (5,000 L; 1,300 US gal)
Firebox:
• Grate area
16.76 sq ft (1.557 m2)
Boiler
GWR Standard No. 21[1]
Boiler pressure
6400: 165 psi (1.14 MPa)
7400: 180 psi (1.2 MPa)
Cylinders
two inside
Cylinder size
16+1⁄2 in × 24 in (419 mm × 610 mm)
Valve gear
Stephenson
Valve type
piston valves
Performance figures
Tractive effort
6400: 16,510 lbf (73.4 kN)
7400: 18,010 lbf (80.1 kN)
Career
Operators
Great Western Railway • British Railways
Class
GWR 6400 and 7400
Power class
6400: BR 2P
7400: BR 2F
Numbers
6400: 6400-6439
7400: 7400-7449
Locale
Western Region
Withdrawn
1958–1965
Disposition
Three 6400s preserved, remainder scrapped. All 7400 locomotives scrapped.
The Great Western Railway (GWR) 6400 Class is a class of 0-6-0 pannier tank steam locomotive introduced by Charles Collett in 1932. All 40 examples were 'auto-fitted' – equipped with the remote-control equipment needed for working autotrains.
The 1936 GWR 7400 Class was a similar class, without the autotrain apparatus, but with a higher boiler pressure of 180 psi, providing a small but useful increase in power. An initial build of 30 in 1936-1937 was added to by British Railways in two batches each of ten locos in 1948 and 1950. These were destined for a short life, the briefest being only nine years. A minor visual difference between the 5400 and earlier 6400, and the later series of 6400, with the 7400 classes was at the join between cab and bunker. The 5400 and early 6400 had an arc whereas the later 6400 and the 7400 class was straight. The early locos also had a lip at the leading edge of the cab roof, whereas the later locos had a plain corner edge.
Both classes were closely related to the 1930 GWR 5400 Class, which was in turn an evolution of both the Armstrong 1874 GWR 850 Class and the Dean 1891 GWR 2021 Class. Thus the basic design was almost sixty years old when new, the 4 ft 7+1⁄2 in (1.410 m) driving wheels being the main distinguishing factor, apart from the more modern profile. There were also superficial similarities with the GWR 645 Class as extant in the 1930s, that also had 4 ft 7+1⁄2 in (1.410 m) wheels and 24 in (610 mm) stroke cylinders (and by then pannier tanks and full cabs).
Table of orders and numbers[2][3]
Year
Quantity
Lot No.
Locomotive numbers
Notes
1932
10
277
6400–6409
1934–35
15
294
6410–6424
1935
5
300
6425–6429
1937
10
305
6430–6439
1936–37
30
307
7400–7429
1948
10
371
7430–7439
1950
10
380
7440–7449
^Champ (2018), p. 319.
^Allcock et al. (1968), pp. 36–40.
^Casserley, H.C. (1958). The Observer's Book of Railway Locomotives of Britain. Frederick Warne & Co.
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