. Electric railways, theoretically and practically treated . E*^ Morizontae Brake IronVrakk Ron JawBrake Jaw Rollerlof Brake Kou ^k Sprinc.[iRAKE HangernBrake Shoe^^E9UALiziN<; Spuing LinkK^uALiziNo Spring CapEqualizing . Tie Spring . Bar)ouble-Elliptic Bar CarrierBolster SafetvHangerngleTie Bar LLIPTIC S|*RING SEAT) CAP is o« top ..- .,)<lVUKLiziNG Barpper Motor Spring E9UALIZINC Spring- Link PUte VI.—BRILL TRDCK, No. 2J. TRUCKS, 197 fixed point of support besides the axle. The p
. Electric railways, theoretically and practically treated . E*^ Morizontae Brake IronVrakk Ron JawBrake Jaw Rollerlof Brake Kou ^k Sprinc.[iRAKE HangernBrake Shoe^^E9UALiziN<; Spuing LinkK^uALiziNo Spring CapEqualizing . Tie Spring . Bar)ouble-Elliptic Bar CarrierBolster SafetvHangerngleTie Bar LLIPTIC S|*RING SEAT) CAP is o« top ..- .,)<lVUKLiziNG Barpper Motor Spring E9UALIZINC Spring- Link PUte VI.—BRILL TRDCK, No. 2J. TRUCKS, 197 fixed point of support besides the axle. The power fromthe motor shaft is transmitted to the axle gear from a pin-ion mounted on the motor shaft. The principal methods of axle gear construction are asfollows: First, the split gear, Fig. 129, which is keyed to the axleand formed of two separate parts bolted together. Thistype of gear may be readily installed or removed withoutdismantling the truck, but is liable to the objection that it. Fig 129. - SPLIT GEAR. may become loose in service and the parts separate, caus-ing damage and delay to service. Second, another type of gear in common use is made inone solid piece, Fig. i 30, which is pressed on to the gearseat on the axle either with or without a key. This typeof gear is extremely satisfactory in practice, but cannotbe removed without pressing one of the wheels off theaxle. The third type of gear is one which is pressed on to aprojection or hub cast on the wheel itself. Some strongpoints may be urged in favor of this construction, one evi-dently desirable characteristic being, that, as the gear isapplied directly to the wheel, the strains transmitted by 198 ELECTRIC RAILWAYS. the axle are for the rotation of one wheel only, the otherone being driven directly by the gear. Gears are usuallymade of cast steel. Brake Rigging. — There are, in general, three locationsavailable for the brake shoes of a truck, as follows: a. Between the wheels (commonly called inside-hun
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