LNER Class V4

LNER Class V4

V4 No. 1700 Bantam Cock in August 1948

Type and origin Power type Steam Designer Nigel Gresley Build date 1940

Specifications Configuration 2-6-2 Leading dia. 3 ft 2 in (0.97 m) Driver dia. 5 ft 8 in (1.73 m) Trailing dia. 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) Loco weight 70.4 long tons (71.5 t) Tender weight 42.75 long tons (43.44 t) Total weight 113.15 long tons (114.97 t) Firebox:  • Firegrate area 28.5 sq ft (2.65 m^2) Boiler 5 ft 4 in (1.63 m) diameter Boiler pressure 250 psi (1.7 MPa) Heating surface 1,799.9 sq ft (167.22 m^2)  • Tubes 884.3 sq ft (82.15 m^2)  • Flues 408.2 sq ft (37.92 m^2)  • Firebox 151.6 sq ft (14.08 m^2) Superheater: ​  • Heating area 355.8 sq ft (33.05 m^2) Cylinders 3 Cylinder size 15 in × 26 in (380 mm × 660 mm) Valve gear Walschaerts outside, Gresley conjugation for inside

Performance figures Tractive effort 27,420 lbf (122.0 kN)

Career Operators London and North Eastern Railway, British Railways Retired 1957 Disposition Both scrapped

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 before, 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.

Features

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-inch 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".

Performance

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.

Withdrawal

Both were scrapped in 1957 when their boilers became due for renewal.

References

• 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