. Electric railways, theoretically and practically treated . aisle at each end of the car, between the longitudinalseats, provides the space necessary for the rapid loadingand unloading of cars, which is essential to the operation ofthe high schedule speeds frequently required. Doors. — The design, arrangement, and fittings of cardoors depend entirely upon the service conditions underwhich the car is to be operated. For an inter-urban car mak-ing infrequent stops, which receives and carries only a steadyload, and discharges passengers at points well distributedalong its line, a single door ope
. Electric railways, theoretically and practically treated . aisle at each end of the car, between the longitudinalseats, provides the space necessary for the rapid loadingand unloading of cars, which is essential to the operation ofthe high schedule speeds frequently required. Doors. — The design, arrangement, and fittings of cardoors depend entirely upon the service conditions underwhich the car is to be operated. For an inter-urban car mak-ing infrequent stops, which receives and carries only a steadyload, and discharges passengers at points well distributedalong its line, a single door opening approximately 30 inchesis sufficient for all purposes. In cars operating in congesteddistricts, with constantly changing passenger loads, such adoor would be wholly inadequate, and it is found necessaryto use double doors connected together by chain or otherde\ice, causing either door to actuate the other, and givinga clear opening of 31 to 4 feet. For cars which must berapidly loaded at one end of the line and unloaded at the I/O ELECTRIC CAR BODIES. 171 Other, carrying frequently the same passengers throughout,even the door above described has been found inadequate,and many cars operated under such conditions areequipped, in addition to the end doors, with wide sidedoors located about the middle of the car. An extremecase is where large numbers of passengers have to behandled rapidly between fixed points (that is, where allthe passengers make the entire trip), and where it isdesirable, on account of limited termmal facilities or forsome other controlling reason, to load and unload the carswith the greatest possible rapidit}-. In such cases carshave been constructed with a number of side doors,opened either by a train guard operating mechanicaldevices connecting the several doors with a lever on thecar platform, or else opened by platform men stationedat the several termini between which such cars areoperated. Weight of Cars.—The question of car weights, wh
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