Talk:British Rail Class 405
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[edit] Traction motors
The change from 275 hp to 250 hp traction motors was made possible by improvements in traction motor design. The early motors were totally enclosed and cooled by radiation from the casing. Later motors were fan-cooled and had a large overload capacity, enabling the new 250 hp motors to deliver the same acceleration as the old 275 hp ones. Biscuittin (talk) 16:00, 11 April 2008 (UTC)
