. Revised and enlarged ed. of the science of railways . ELECTRICITY AS A MOTIVE POWER. 469. Eailway Motor, spring mounted. pair of small wheels. The truck frames are so proportioned that the greater part ofi the ^veight on each truck is borne by the 4 heavy axle and ^vheels, to which the motors are connected, and a high tractive effort is obtained without slipping the wheels. The Motor. Mechanical Requirements.—Since the service re-quired of railway motors is especially severe,particular attention must be paid to certainmechanical points: (1) Weight.—The motor should be as light aspossible, to
. Revised and enlarged ed. of the science of railways . ELECTRICITY AS A MOTIVE POWER. 469. Eailway Motor, spring mounted. pair of small wheels. The truck frames are so proportioned that the greater part ofi the ^veight on each truck is borne by the 4 heavy axle and ^vheels, to which the motors are connected, and a high tractive effort is obtained without slipping the wheels. The Motor. Mechanical Requirements.—Since the service re-quired of railway motors is especially severe,particular attention must be paid to certainmechanical points: (1) Weight.—The motor should be as light aspossible, to lessen w^ear and tear on track; to avoidcarrying the extra weight; to facilitate armature, especially, should be light. (2) Size.—The external dimensions are fixedby the truck, the wheel base, the gauge and thediameter of wheel. Motors of special shapes arefrequently required for certain classes of example, motors of large powers to bemounted on trucks w4th very short wheel basemust be rectangular in form in order to be sus-pended between the axles and bolst
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