description LNER B1 Class Overview
The LNER B1 Class was a British 4-6-0 mixed-traffic steam locomotive designed by Edward Thompson for the London and North Eastern Railway (LNER). Introduced in 1942, the class was developed as a standardized wartime design to handle passenger and freight trains efficiently. A total of 410 locomotives were built between 1942 and 1952, and they were primarily used to replace older, less efficient Victorian-era engines across the LNER network.
help LNER B1 Class FAQ
Why was the LNER B1 designed as a mixed-traffic locomotive?
Edward Thompson wanted a standardized 4-6-0 that could handle both passenger and freight work during wartime. The first B1 entered service in 1942, when flexibility and ease of production were especially valuable.
How many LNER B1 locomotives were built?
A total of 410 were constructed for the LNER and, after nationalization, British Railways. Building continued into the early 1950s.
Why were B1 locomotives nicknamed Bongos?
The nickname came from the first member of the class, No. 8301 Springbok, and the wider antelope naming theme. Railway workers extended the animal association to the informal name "Bongo."
Which LNER B1 locomotives survive in preservation?
Two survive: No. 1264, an original LNER-built engine, and No. 61306 Mayflower, built for British Railways. Mayflower has operated main-line excursion trains in preservation.
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