. Railway mechanical engineer . truck of the motor car hasfixed axles and drives through three chains, two of the chainstransmitting the power from the diffirnitial shaft, the third ,ipacity for 56 Passengers on each heater which drives the hot air through the carsand distributes the heat uniformly. The air brake system is a standard Westinghouse tractionbrake that the compressors are of special design madeby the Edwards Railway Motor Car Company. There aretwo compressors, one driven from the line shaft and onefrom the of the rear truck. The compressor drivenfrom the line shaft i
. Railway mechanical engineer . truck of the motor car hasfixed axles and drives through three chains, two of the chainstransmitting the power from the diffirnitial shaft, the third ,ipacity for 56 Passengers on each heater which drives the hot air through the carsand distributes the heat uniformly. The air brake system is a standard Westinghouse tractionbrake that the compressors are of special design madeby the Edwards Railway Motor Car Company. There aretwo compressors, one driven from the line shaft and onefrom the of the rear truck. The compressor drivenfrom the line shaft is used Ijcfore the car is in is then cut out and the compressor driven from the axleis used tliereafter. Both compressors weigh only 140 furnish 10 cubic feet of air per minute. An automatic 453 454 RAILWAY MECHANICAL ENGINEER Vol. 96, No. 8 cut-out device stops the compressors when the required pres-sure is obtained and a reduction starts them cars are notable for their light weight in relation to. Looking Forward from the Rear of the Trailer the seating capacity. The motor car weighs 782 lb. per pas-senger, the trailer 275 lb. and the combined unit 478 lb. perpassenger. Recent Decisions of the ArbitrationCommittee {The Arbitration Committee of the MechanicalDivision is called upon to render decisions on a large num-ber of questions and controversies which are submitted fromtime to time. As these matters are of interest not only torailroad officers hut also to car inspectors and others, it hasbeen suggested that information in regard to such decisionswould be welcomed. The Railway Mechanical Engineer will,therefore, print abstracts of decisions as rendered.) _ Settlement for Cars Destroyed in Switching Alabama & Vicksburg box car No. 22627 was damagedwhile being switched by the Northern Pacific in its Pasco,Wash., yards, for the Spokane, Portland & Seattle. NorthernPacific accident report dated May 19, 1920, shows that theair brakes on the c
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