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| (1640629) | |
6th ave crossover |
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Posted by Baltimorerail on Thu Apr 10 14:30:56 2025 Why does the 6th Ave southbound local and express south of 49th street swap sides? |
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| (1640635) | |
Re: 6th ave crossover |
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Posted by AlM on Thu Apr 10 15:25:39 2025, in response to 6th ave crossover, posted by Baltimorerail on Thu Apr 10 14:30:56 2025. I've always assumed it was because it would be much messier to have the southbound B and D make a turn into the express tracks than into the local tracks. And further south, the D is meant to be an express (though the through tracks to W 4th didn't happen right away).Northbound of course that situation doesn't occur. |
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| (1640638) | |
Re: 6th ave crossover |
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Posted by Dupont Circle Station on Thu Apr 10 15:41:38 2025, in response to 6th ave crossover, posted by Baltimorerail on Thu Apr 10 14:30:56 2025. South of 47-50th Streets-Rockefeller Center. 49th is on the BMT Broadway line.It was necessary because there isn't sufficient clearance for the southbound track from the Queens Boulevard line to cross north of the station. 
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| (1640645) | |
Re: 6th ave crossover |
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Posted by Wallyhorse on Thu Apr 10 23:09:24 2025, in response to Re: 6th ave crossover, posted by AlM on Thu Apr 10 15:25:39 2025. It's because the B and D are coming from 8th Avenue eastbound whereas the F is coming westbound on 5th Avenue from 53rd Street. It was likely much easier to have them continue to 47-50 southbound and then cross over to the correct sides between there and 42nd Street. |
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| (1640647) | |
Re: 6th ave crossover |
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Posted by Steve B-8AVEXP on Fri Apr 11 13:49:02 2025, in response to Re: 6th ave crossover, posted by Wallyhorse on Thu Apr 10 23:09:24 2025. 47-50th Sts. has a twin-level layout, but the tracks are all on the same level. You'll notice at the north end how the F track ramps down as it enters the station. |
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| (1640650) | |
Re: 6th ave crossover |
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Posted by Elkeeper on Fri Apr 11 16:48:48 2025, in response to Re: 6th ave crossover, posted by Steve B-8AVEXP on Fri Apr 11 13:49:02 2025. Sorta begs the question- why not have crossover tracks in both directions, south of 47-50th Streets? |
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| (1640657) | |
Re: 6th ave crossover |
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Posted by AlM on Fri Apr 11 19:45:27 2025, in response to Re: 6th ave crossover, posted by Elkeeper on Fri Apr 11 16:48:48 2025. ???Northbound, before the 63rd Street tunnel existed, the F (local) wanted to make a right turn and the D (express) wanted to make a left. So obviously there was no need to switch tracks. |
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| (1640660) | |
Re: 6th ave crossover |
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Posted by gbs on Fri Apr 11 21:27:57 2025, in response to Re: 6th ave crossover, posted by AlM on Fri Apr 11 19:45:27 2025. Correct. At the north end of the station, the uptown platform is already dipping down lower than the downtown platform, in preparation for the uptown B/D to turn west and enter the lower level of 7 Avenue, and the Queens-bound M to head east and enter the lower level of 5 Avenue. Here's an uptown D leaving the station (already lower than the arriving downtown F). It will soon pass under the downtown F track on its way to 7 Avenue: 
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| (1640673) | |
Re: 6th ave crossover |
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Posted by Steve B-8AVEXP on Sat Apr 12 11:26:56 2025, in response to Re: 6th ave crossover, posted by Elkeeper on Fri Apr 11 16:48:48 2025. You already have a homeball alley between 34th and 42nd Sts. The 6th Ave. line is equipped to turn trains in either direction. Those switches used to see much more action than they do now. |
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| (1640681) | |
Re: 6th ave crossover (Tracks B5/B6 vs. Tracks |
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Posted by New Flyer #857 on Sat Apr 12 19:51:57 2025, in response to Re: 6th ave crossover, posted by gbs on Fri Apr 11 21:27:57 2025. Does anyone know the order from top to bottom of the tracks that go straight (the F line tracks B5 and B6 as they cross the E line tracks D3 and D4)? Are all E trains (in both directions) under all F trains (in both directions) or is it different? |
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| (1640691) | |
Re: 6th ave crossover (Tracks B5/B6 vs. Tracks |
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Posted by gbs on Sat Apr 12 20:46:37 2025, in response to Re: 6th ave crossover (Tracks B5/B6 vs. Tracks, posted by New Flyer #857 on Sat Apr 12 19:51:57 2025. You're talking about the intersection of 6th Ave & 53rd St. Top to bottom: both F tracks (cut & cover) Manhattan-bound E track (deep bore) Queens-bound E track (deep bore) This map isn't 100% accurate about over/under (and other things: notice how it appears that the 51 St platforms (6) reach 53rd St, when they actually reach only to 52nd St -- to transfer between the 6 and E/M you have to walk the block between 52 & 53 Sts underground) but the intersection of 6th&53rd is correct.  Another error: the map shows the downtown M track between 5th Av and 47-50 Sts going under the uptown F track, when the uptown F track goes under the M track. (Leaving 47-50 the uptown F track has dipped down. After passing under the M track, it rises to 57 St. |
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| (1640694) | |
Re: 6th ave crossover (Tracks B5/B6 vs. Tracks |
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Posted by New Flyer #857 on Sun Apr 13 06:52:42 2025, in response to Re: 6th ave crossover (Tracks B5/B6 vs. Tracks, posted by gbs on Sat Apr 12 20:46:37 2025. Thank you!Leaving 47-50 the uptown F track has dipped down. After passing under the M track, it rises to 57 St. Yes, I think this is what always confused me! I could never figure out for sure what level that uptown F was at. Observation shows the southbound M coming into Rockefeller Center seemingly high up, so it was never clear to me how far down the uptown F was going and whether it ever got beneath either or both of the E tracks. |
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| (1640716) | |
Re: 6th ave crossover |
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Posted by zac on Mon Apr 14 10:41:06 2025, in response to Re: 6th ave crossover, posted by Steve B-8AVEXP on Sat Apr 12 11:26:56 2025. 34th used to be the terminal for the rush hour BB and the weekend/night F. I remember when I got on at 34th for my first ride on an R38 F to Queens. It lit the station up. |
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| (1640756) | |
Re: 6th ave crossover |
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Posted by Chris R16/R2730 on Tue Apr 15 18:18:17 2025, in response to Re: 6th ave crossover, posted by AlM on Thu Apr 10 15:25:39 2025. That's my thought as well. It's veeery complicated just above 50th St with the line splitting in 3 directions....the unusual alignment of the southbound platform was probably done to prevent it being even more complex to build. |
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| (1640789) | |
Re: 6th ave crossover |
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Posted by Steve B-8AVEXP on Wed Apr 16 14:25:19 2025, in response to Re: 6th ave crossover, posted by Chris R16/R2730 on Tue Apr 15 18:18:17 2025. They must have figured it would be much easier for s/b trains to trade places south of the station. |
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