This month, Keith Farr looks at the performance of the ‘WT’ class 2-6-4 tank locos that were built at Derby Works for the Northern Counties Committee. In ‘Tank Engines Triumphant’ (March 2017), we examined the highly successful LMS and BR 2-6-4Ts designed under Fowler, Stanier, Fairburn and Riddles. Another member of the family, the Derby-designed…
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