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British Railway Locomotives Diesel And Electric Locomotives 5 Small
British Railway Locomotives Diesel And Electric Locomotives 5
British Railway Locomotives Diesel and Electric Locomotives part 5
The abc of British Railways Locomotives
Part 5 Diesel and Electric Locomotives
Ian Allen
Soft Cover Small stapled
64 Pages
Copyright 1961 Winter 2 Edition
Contents
Introduction
Numerical List of Diesel Locomotives
Eastern Region Diesel Locomotive Classification
25 kV a.c. Electric Locomotives
Direct Current Electric Locomotives
Southern Region
Numerical List of Electric Locomotives
THE speed/tractive effort performance of a diesel locomotive is fixed by the available horsepower of the diesel engine, making due allowance for transmission losses and the power required for operating the auxiliary services. Maximum speed depends directly on the horsepower available ; maximum tractive effort, however, (which may be required to move a train from standstill) may be obtained by appropriate gearing with lower horsepower. The shape of the locomotive speed/tractive effort characteristic curve is not affected by a change in gear ratio ; thus an increased ratio for a particular range of the curve will provide a higher maximum tractive effort with a reduction in maximum speed. In other words, the only effect of a change of gear ratio is to move the performance range up or down the constant-horsepower curve. On a steam locomotive, the size of the driving wheels is the deciding factor ; on a diesel or electric locomotive, the transmission reduction gearing can be selected to suit the duties for which the locomotive is to be used. The Type B 25kV electric locomotives, identical save for gearing with the Type A, have a lower maximum speed and a higher tractive effort ; the Type A can haul a 950-ton freight train on the main line at an average speed of 42 m.p.h. and a maximum speed of 55 m.p.h., whereas the Type B can haul a 1,250-ton freight train on the main line at the same speeds, but is capable of a maximum speed of only 90 m.p.h., against the Type A's 100 m.p.h. High tractive effort is obtainable with a relatively low power output. The production " Deltics " can develop high tractive effort when using only one Napier diesel engine, but only low road speed
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