Railway Signaling

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This is a single-rail return system with direct-current propulsion, as was previously explained. The vane type of relay was used in this installation.
SATTERY FIG. 256. Track and signal circuits on a portion of the New York subway. (Union Switch and Signal Co. ) Figure 257 illustrates the track and signal circuits used on a portion of the Long Island Railroad. 1 This is a center-fed con- struction with the vane type of relay used at each end of the block.
Figure 258 represents the signaling pla
...n used on another portion of the Long Island Railroad. The track transformer is attached to the rails near the middle of the track section, and a galvanometer type of relay is used at each end, the one at the exit end of the track circuit being a two-position and the one at the entrance end a three-position relay. The armatures of the relays are energized directly from the track circuit. The field of the relay at the exit end of the track circuit is energized directly from the 55-volt transformer; the field of the relay at 1 Pages 412 and 413, Proceedings Railway Signal Association, 1910.

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