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| Re: 6th Ave roller coaster (1413195) | |||
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Re: 6th Ave roller coaster |
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Posted by gbs on Wed Oct 19 00:11:42 2016, in response to 6th Ave roller coaster, posted by Fulton Frank on Tue Oct 18 22:37:35 2016. The B/D track from 7 Av (which becomes the 6 Av express track) enters 47-50 St along the wall, while the track from Queens (which becomes the 6 Av local track) enters in the middle, so between 47-50 St and 42 St the tracks change places: the B/D track dives under the F/M track and then rises into 42 St in the middle. Entering 42 St the IND tracks pass under the Shuttle tracks, then they rise at 41 St passing over the #7 tracks (west of the 5 Av station the #7 tracks wind south under Bryant Park from running under 42 St to running under 41 St). Entering 34 St the IND tracks dip under the BMT tracks, then rise immediately to pass over the LIRR tracks. And this was all constructed, mostly cut-and-cover, under the functioning 6 Av elevated tracks. An ST 30 sign would not be there for the curve. That sign would indicate that the following station is under station time control, which allows a train to enter the station at the posted speed and approach the train ahead as it's leaving the station, before the entire block is clear. Here's the full explanation: Station Time |
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