Railway Engineering and Maintenance Volume 13, No. 6

Railway Engineering and Maintenance Volume 13, No. 6

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...showed some form of crossing signs, 7 of them showing wig-wag, swinging pendulum type signals. These signs are, in most cases, operated by track circuits, which are closed by the movement of a train onto the track within the limits fixed by the bonding of the rails for that purpose. The closing of the track circuit releases the operating mechanism of the signal, resulting in the display of a red light in the center of the pendulum and the swinging of it back and forth to the accompaniment of the ringing of a crossing bell, the operation continuing until the train passes out of the bonded section of track. One type of crossing signal was so constructed that when a train entered the block, a board was displayed bearing the word, "Stop," and when the block was cleared, the stop sign was lifted from sight. Eleven exhibitors had one or more types of crossing bells on display. In most cases a gong type of bell was shown, but a number made use of the engine-bell type mounted on the top of a post. Other designs of crossing signs were shown, some of which used various systems of lights to indicate the approach of a train. The large display of audible and moving crossing signals drew attention to the need of the systematic collection of data showing the percentage of the failures of such devices to indicate the approach of trains correctly. It is obvious that a false clear signal at a crossing is much more dangerous than no signal whatever, and as such signals are being demanded more and more by legislative enactment, information should be collected to show whether such devices are an added safeguard or an added danger to the public. Only one exhibitor was on hand with a display of switch and signal lamps and accessories, but the...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123683304X
  • 9781236833044