LNER Class V4
V4 No. 1700 Bantam Cock in August 1948
|Type and origin|
|3 ft 2 in (0.97 m)|
|Driver diameter||5 ft 8 in (1.73 m)|
|3 ft 2 in (0.97 m)|
|Wheelbase||29 ft 4 in (8.94 m) engine
13 ft 0 in (3.96 m) tender
50 ft 2 1⁄4 in (15.297 m) total
|Axle load||17 long tons (17 t)|
|Locomotive weight||70.4 long tons (71.5 t)|
|Tender weight||42.75 long tons (43.44 t)|
|Locomotive and tender
|113.15 long tons (114.97 t)|
|Boiler||5 ft 4 in (1.63 m) diameter|
|Boiler pressure||250 psi (1.7 MPa)|
|Firegrate area||28.5 sq ft (2.65 m2)|
|884.3 sq ft (82.15 m2)|
|– Flues||408.2 sq ft (37.92 m2)|
|– Firebox||151.6 sq ft (14.08 m2)|
|– Total||1,799.9 sq ft (167.22 m2)|
|Superheater area||355.8 sq ft (33.05 m2)|
|Cylinder size||15 in × 26 in (380 mm × 660 mm)|
|Valve gear||Walschaerts outside, Gresley conjugation for inside|
|Tractive effort||27,420 lbf (122.0 kN)|
|Operator(s)||London and North Eastern Railway, British Railways|
The London and North Eastern Railway Class V4 was a class of 2-6-2 steam locomotive designed by Sir Nigel Gresley for mixed-traffic use. It was Gresley's last design for the LNER before he died in 1941. The V4s had similarities in their appearance and mechanical layout to the V2 "Green Arrow" class. The V2s, introduced some years previously, were large and heavy locomotives, with very limited route availability. The V4 was a lightweight alternative, suitable for use over the whole of the LNER network.
Two locomotives were built at the LNER's Doncaster Works in 1941. The first engine, 3401 Bantam Cock, had a scaled down version of the Gresley Pacific boiler with a grate area of 27.5 sq ft. Its tractive effort of 27,000 lbs was produced by boiler pressure of 250 psi and three cylinders of 15" diameter. The second locomotive, 3402, incorporated a fully welded steel firebox and a single thermic syphon for water circulation. It was not named, but was known unofficially as "Bantam Hen".
The type was tried on the Great Eastern section of the LNER, and was well received, with more power than the existing B17's and better riding qualities. It was anticipated that many more would be produced, but after the death of Gresley and his succession by Edward Thompson, no more were built. Instead, the LNER Thompson Class B1 was adopted as the LNER's standard mixed-traffic locomotive.
Service in Scotland
The two locomotives were sent to Scotland for use on the West Highland Line, although their wheel arrangement was not particularly suitable for the steep gradients on the line. They were renumbered 1700 and 1701 in 1946, and later became British Railways 61700 and 61701.
Both were scrapped in 1957 when their boilers became due for renewal.
- Longworth, Hugh (2005). British Railway Steam Locomotives 1948-1968. Hersham: Ian Allan. ISBN 978-0-86093-593-3.
- Willie Yeadon, Yeadon's Register of LNER Locomotives Vol.4. Gresley V2 and V4 classes. Irwell Press, 1992
- LNER Encyclopedia
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