[2] A "notable addition" to the Metropolitan Railway,[3] these locomotives were purchased for the express passenger trains on the mainline between Harrow (later Rickmansworth)—the change point from electric locomotives—and Aylesbury or Verney Junction.
They were designed by The Met's Locomotive & Chief Electrical Engineer, Charles Jones.
The H Class were considered to be good engines well-suited to the express trains they worked, allowing for a reduction in running times of up to six minutes.
In the 1940s, they were moved from Neasden (LNER) shed to the Nottingham area and worked over other parts of the former Great Central Railway system.
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