File:Operation of trains and station work and telegraphy (1916) (14735861356).jpg

Identifier: operationoftrain02prio (find matches)
Title: Operation of trains and station work and telegraphy
Year: 1916 (1910s)
Authors: Prior, Frederick John, 1858- (from old catalog) comp
Subjects: Railroad trains Railroads
Publisher: Chicago, F. J. Drake & co
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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r staff. This operation opens the controllingcircuits of the system and closes the circuits on the pusherbells (Plate 18). Y then hands the absolute staff tothe train and the pusher staff to the pusher engine. Thetrain passes through the section and delivers the absolutestaff at X. This is placed in the instrument there, thepusher engine retaining the pusher staff and returning toY. Until this latter staff is put into the pusher attach-ment at Y and locked, the staff circuits are not re-es-tablished and no other staff can be released. Circuit Controller Attachment.—Another attach-ment called the circuit controller attachment (see Figure131) is used where electric signals are operated in placeof mechanical. This attachment is arranged to controlthe staff and signal circuits. The signal circuits controll-ing the signals for a through movement cannot be closeduntil the staff has been used to release same, which staffcan be taken out when said release is made. STATION AND TRAIN WORK 415
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Eh aw Q < <J o op I—I 416 rules for movement of trains Staff System on the Southern Pacific Railway.■—There is a long continuous staff blocking on the South-ern Pacific Railway between Truckee and Colfax, Califor-nia, a distance of 98 miles, divided into 37 blocks. Thisportion of the Southern Pacific is in the Sierra NevadaMountains, and 14 of the staff stations are located in thesnow sheds. Here the staff station is at the center of apassing siding. The staff system is worked in conjunc-tion with electric signals so that trains may pass with fa-cility and safety. Through the snow sheds it was found that neither themodern electric semaphore signal nor the ancient types ofbanner and banjo signals could be installed, so Mr. W.W. Slater, Signal Engineer of the Southern Pacific, de-signed a neat and compact disc signal suitable for thisparticular condition. The general arrangement of tracks and signals at eachof the staff stations is shown on Plate 19. All signalsin the horizo

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