. Revised and enlarged ed. of the science of railways . ht. (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 bolster of thetruck. These mechanical limitations often de-termine the electrical design and type of motor. (3) Strength.—The entire motor should be al)loto stand the tremendous strains and shoc
. Revised and enlarged ed. of the science of railways . ht. (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 bolster of thetruck. These mechanical limitations often de-termine the electrical design and type of motor. (3) Strength.—The entire motor should be al)loto stand the tremendous strains and shocks, no 170 RAILWAY EQUIPMENT. well as the continued vibration which are un-avoidable in railway service. Steel motors com-bine strength and light weight so advantageouslythat they are now generally used for heavy rail-way work. (4) Suspension.—The motor should be sus-pended as much as possible by springs, whichwill prevent sudden shocks and shield the caraxles from undue strains. In the case of gearedmotors the weight of the motor is divided be-. Thirty-five Horse-Power Railway Motor, with Gear Case and Car Axle. tween the frame of the truck and the axle. Sin-gle reduction gearing has superseded the olderdouble reduction type and admits of a simpleand effective spring suspension for the motors, which must be constructed torun at a low armature speed, are more difficultto suspend properly because of the greater weightand size for a given output, and because the en-tire weight of the motor is centered at the on axles and wear and tear on track are,therefore, greatly increased unless a hollow sleevesuspension with ilexible spring connections is
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