. The Street railway journal . two units each. Each unit will weigh ap-proximately 62 tons, and, as stated, will develop a draw-barpull of 25,000 lbs. on a 2 per cent grade at a speed of 10 is of the rigid frame type, with driving axle boxes held in thesame frame that contains the draft gear. It will be mountedon three pairs of driving wheels, which will sustain the entireweight, distributed by equalizer bars similar to those used insteam locomotive practice; will have an outside frame sup-ported on semi-elliptical springs, and will be equipped with Westinghouse combination automatic
. The Street railway journal . two units each. Each unit will weigh ap-proximately 62 tons, and, as stated, will develop a draw-barpull of 25,000 lbs. on a 2 per cent grade at a speed of 10 is of the rigid frame type, with driving axle boxes held in thesame frame that contains the draft gear. It will be mountedon three pairs of driving wheels, which will sustain the entireweight, distributed by equalizer bars similar to those used insteam locomotive practice; will have an outside frame sup-ported on semi-elliptical springs, and will be equipped with Westinghouse combination automatic and straight air andAmerican driver brakes will be used. The air supply will beprovided by a two-cylinder motor-driven air compressor hav-ing, with a 5-in. stroke and a speed of 190 r. p. m., a capacityof 45 cu. ft. of air per minute. Air reservoirs, signal outfits,whistle, bell with pneumatic ringers, automatic pump governor,tools, instruments, gages, headlights, push poles and other de-tails complete the auxiliary FIG. 3.—CURVE SHOWING POWER REQUIRED BY A. C. LOCOMOTIVES TO DRAW 1000-TON TRAINS THROUGH TUNNEL A motor will be geared to each axle, giving each unit anaggregate rated capacity of 750 hp. The motors are of thesingle-phase, compensating type, and will weigh complete ap-proximately 14,500 lbs. The armature will weigh approxi-mately 5600 lbs. The motor frame consists of a steel cylindertype, cast in one piece, and enclosed at the end by brackets ofthe same material, which carry the bearings and oil suspension noses and safety lugs form a part of the maincasting. Seats for the axle bearings are cast solid with theframe. All bearings are of phosphor bronze, lined with bab-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
