What do the signal bridge(s) signal? Are they on both sides.
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The are used the same way that signals on any railway are used. The signals (on the signal bridges) control railway traffic by indicating to the motormen/engineers what rules to follow.
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Both sides? Both sides of what?
Thanks Arthur, I understand that the signals are intended to relay information, But I don't understand what information would be needed or changes as the train enters the bridge. Signaling curve ahead? Is there any switching near the bridge? What is the typical distance of a signal before switching?
Do the signals just happen to be in that location and not because of the bridge.
I don't intend to be dense, just trying to understand.
Arthur is correct. The signal location was determined by the block length, not by the bridge. Between the time it was built (1917) and the 1960's the bridge was 4 tracks and very busy. Today there are 3 tracks, 2 Amtrak and 1 for freight. The freight track, probably, sees 2 trains per day (I use to work next to the track). Amtrak has about 20 trains per day, in each direction. On the southbound side, in addition to spacing, the signals are governing traffic into Penn. There is one crossover about 2 miles south of the bridge (toward Penn station) and several others in the Sunnyside area allowing the use of either of the 2 Amtrak bores into Penn. The other 2 tubes are reserved for the Long Island RR.
Hope this helps.
