description LNER K4 Class Overview
The LNER K4 Class was a class of 2-6-0 Mogul type steam locomotives designed by Nigel Gresley for the London and North Eastern Railway (LNER) in 1937. These powerful engines were specifically built to handle the steep gradients and tight curves of the West Highland Line in Scotland, including the haul of passenger trains on remote routes. Due to changes in operating requirements, only six were ever built. Despite their limited numbers, the K4s served as an essential part of Scottish rail transport before being withdrawn from service in the mid-20th century.
help LNER K4 Class FAQ
Why was the LNER K4 designed for the West Highland Line?
The route to Fort William and Mallaig combined steep gradients, tight curves, and restrictive axle-load limits. Nigel Gresley's three-cylinder 2-6-0 design supplied greater pulling power without using an excessively heavy locomotive.
How many LNER K4 locomotives were built?
Darlington Works built six K4 locomotives between 1937 and 1939. They originally carried LNER numbers 3441 through 3446.
Does any LNER K4 survive?
Yes, No. 3442, later British Railways No. 61994, The Great Marquess, is the sole preserved member. The other original K4s were scrapped or, in one case, rebuilt.
What happened to K4 No. 3445 MacCailin Mor?
Edward Thompson rebuilt No. 3445 as the two-cylinder K1/1 prototype in 1945. That experiment influenced the later British Railways K1 class.
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