File:The street railway review (1891) (14758347981).jpg

Identifier: streetrailwayrev14amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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lied froma shunt around one of the lamps in the signal circuit, or in shuntaround a resistance placed in series with lamps of the signal circuit.The bell circuit is then wired in such manner that the opening ofthe circuit will close the signal circuit, and the bell will continueto ring until the circuit-breaker is closed again. The use of dynamocurrent in this manner can always be relied upon, and it eliminatesunreliability and the troubles usually experienced where batteriesare employed. New Cars for iMetropolitan Elevated, Chicago. Up until the present the two railway companies operating overthe inner track of the elevated loop in Chicago have had differentsystems of electrical control. The Metropolitan, the first of the ele-vated roads to be operated electrically, has had but a single motorcar in each train. The South Side elevated, when it changed itsmotive power from steam to electricity, adopted the Sprague multi-ple unit control. The acceleration curves of these two systems arc
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flattened. The process is simple, quick, and leaves a smooth andperfect pin. The lap is of lead or of cast-iron faced with lead and is madein halves with liners, similar to an eccentric strap. The faces ofthe two halves should be fitted together nicely and the lap be boredto the size of the pin to be lapped, with the liners slotted so as tofacilitate their removal without taking out the bolts. For a pin very different, the Metropolitan trains accelerating more slowlyto a higher maximum speed, while the South .Side trains acceleraterapidly to a lower maximum speed and can coast for a consider-able distance before the brakes are applied. The consequence ofalternating trains with these different methods of control is aninterference resulting in a loss of time in making the loop circuitthat is quite a serious matter. The time occupied in passing July 20, 1904.) STREET RAILWAY REVIEW. 487 around the loop is about 14 minutes and a minute saved in thispart of the trip means an increase of 7

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