Prototype 3000 v d-c locomotive EF 90 designed for moving express freight trains on 3 ft 6 in. gage trucks at 120 km/hr is described; EF 90 is of B-B-B wheel arrangement; feature of traction characteristics of locomotive is large output in higher speed range; balancing speed up 1% gradient is 69 km/hr with 1200-ton train; 95 km/hr can be maintained on level with same weight; range of speed control has been widened by providing eight weak field control steps for each of series and parallel connections of six traction motors; bridge transition is used for conversion from series to parallel operation to reduce sudden variations in motor torque.
D.C. Locomotive for high speed freight work
Ry Gaz
Railway Gazette ; 124 , n 24
1967
3 pages
Aufsatz (Zeitschrift)
Englisch
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