. Electric railway journal . e shoes to the proper wheel bearing,and to wear off the hard outer skin of the shoes than is thecase on heavier cars. In view of this loss of braking power the manufacturer has recom-mended that properties operat-ing safety cars make shoerenewals one at a time asfar as possible, allowing severaldays between successive replace-ments. This situation has beentaken up with the brakeshoemanufacturers and their atten-tion called to the excessivevariation in new and old shoeperformance, with the idea tohaving this variation reducedto a minimum. The motor equipment forthes
. Electric railway journal . e shoes to the proper wheel bearing,and to wear off the hard outer skin of the shoes than is thecase on heavier cars. In view of this loss of braking power the manufacturer has recom-mended that properties operat-ing safety cars make shoerenewals one at a time asfar as possible, allowing severaldays between successive replace-ments. This situation has beentaken up with the brakeshoemanufacturers and their atten-tion called to the excessivevariation in new and old shoeperformance, with the idea tohaving this variation reducedto a minimum. The motor equipment forthese cars consists of 100 equip-ments of GE-264-A motors and100 equipments of Westing-house 560-E-lO motors. Bothmanufacturers are furnishinga box-frame, commutating-pole, self-ventilating type ofmotor. In the specifications for these equipments themanufacturers were furnished with the dimensions andapproximate weight of the cars and additional operatingdata and information as given in Table III. TABLE in—SERVICE REQUIREMENTS. SECTIONAL VIEW OF FOOTVALVE Diameter of driving wheels, new Diameter of driving wiieels, worn out Estimated total weight of car completely equipped but without passenger Estimated maximum passenger load Estimated average passenger load on which speed graphs were based Trolley voltage, minimum . Maximum . Average .. Schedule speed Number of stops per mile. ..Average rate of accelerationAverage rate of bralcing . ...Duration of coast 26 in. 16, ,950 lb. each, Average duration of stops .Radius of sharpest cune . Maximum grade Length of maximum grade 24 passengers at 140 lb. 3,3U0 Not less than an average of 10 seconds for each 528 ft. per cent. 1200 ft. ; being a portion of acontinuous grade of approxi-mately ft. The motors were required to operate at voltages between300 and 750 without damage to any part, and to withstandwithout flash-over
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