. The street railway review . ble forcity service where the car bodies are carried low,is a novel feature. The truck frame is carried onthe springs, which are located between the equal-izer bars and close to the journal boxes. Thebolster spring in this truck is a double elliptic,34 in. long, with four leaves which are 4 in, arrangement of springs gives a very easyriding truck and one which does not oscillate ona rough track at the highest speed at which it hasbeen tested, which was from 35 to 40 miles perhour. The elliptic spring in the long wheel basetruck is a new form designed to
. The street railway review . ble forcity service where the car bodies are carried low,is a novel feature. The truck frame is carried onthe springs, which are located between the equal-izer bars and close to the journal boxes. Thebolster spring in this truck is a double elliptic,34 in. long, with four leaves which are 4 in, arrangement of springs gives a very easyriding truck and one which does not oscillate ona rough track at the highest speed at which it hasbeen tested, which was from 35 to 40 miles perhour. The elliptic spring in the long wheel basetruck is a new form designed to go in the spaceallowed in such trucks, which is usually smallowing to the room required by the motorsand the limitations of the wheel base. Narrow springs with a largeenough number of leaves in order to carry the load are hard riding,owing to the damping effect of too many leaves. This spring isa double elliptic, 37 in. long, with 6 leaves each 3H in. wide. Inorder to reduce the damping effect the leaves were divided so as to. WOK . IT WHEEL BASE TRUCKS. form two independent springs, each with three leaves, one springof three leaves being outside of the other, but both being securedby the same bands. The riding effect of this spring is the sameas if it were a quadruple elliptic 37 in. long with three leaves each3/5 in. wide, which would be a very easy riding spring, similar towhat is u«ed in steam railroad practice, but which could not be used in electric trucks, owing to the limited space. The equalizerbars are rigidly connected across the truck, so that they cannotbe tilted by the pull of the brake hangers. In both trucks thebolsters arc carried on swinging hangers, and there are no springbuffers at the ends of the bolsters. The ease with which these carbodies swing around the curves at high speeds isconsidered to indicate that the bolster buffersprings are at least unnecessary. The side frames are protected from wear be-tween the journal box jaws by a covering of steelplate
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
