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D1-D10 were all rated at 2300hp, D2 was uprated to 2500hp for tests which led to this rating being adopted for the later members of the class. They were at first allocated to Camden (1B) for use between Euston and Glasgow, from September 1959 they were transferred to the Midland Main Line and worked St. Pancras-Manchester, with the ongoing delivery of class 45 the class 44's gravitated to Toton in 1962 and were frequently found hauling coal trains.
My book gives max speed as 90 MPH for all class 44, 45 & 46.
Class 44 tractive effort was originally given in the Ian Allan books as 70.000 lbs, the preserved locos books say 50.000 lbs.
Regards, 62440.
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