Single switch distance

Discussion relating to the past and present operations of the NYC Subway, PATH, and Staten Island Railway (SIRT).

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FRN9
Posts: 338
Joined: Sun Jan 18, 2009 1:29 pm

Single switch distance

Post by FRN9 » Sun May 29, 2011 6:14 pm

Does anyone know How much track length (in feet) is needed for a single switch from one line to another (vs. a double switch between both lines)?

Thanks

F

DaveBarraza
Posts: 301
Joined: Fri Aug 31, 2007 10:52 pm
Location: Out Past Ronkonkoma, NY

Re: Single switch distance

Post by DaveBarraza » Thu Jun 02, 2011 5:37 pm

Turnout Length depends on sharpness. Say, 150-200 feet on average from the point-of-switch to the point where the divergent track becomes tangent again.

FRN9
Posts: 338
Joined: Sun Jan 18, 2009 1:29 pm

Re: Single switch distance

Post by FRN9 » Thu Jun 02, 2011 10:03 pm

DaveBarraza wrote:Turnout Length depends on sharpness. Say, 150-200 feet on average from the point-of-switch to the point where the divergent track becomes tangent again.
What would be the shortest distance possible with imaging an Island platform width between the tracks (so right before the stop)?

Thanks,
f

jlr3266
Posts: 550
Joined: Thu Mar 18, 2004 7:32 am

Re: Single switch distance

Post by jlr3266 » Fri Jun 03, 2011 8:25 am

My alignment engineers tell me they would need the track speed, platform length, RR standards, breaking distance for the equipment, grades, and a charge number. It's not that easy.

DaveBarraza
Posts: 301
Joined: Fri Aug 31, 2007 10:52 pm
Location: Out Past Ronkonkoma, NY

Re: Single switch distance

Post by DaveBarraza » Fri Jun 03, 2011 6:17 pm

On the IRT the frog numbers generally went down as low as #5, but this requires 10mph operation.

IND installed #8's and longer.

FRN9
Posts: 338
Joined: Sun Jan 18, 2009 1:29 pm

Re: Single switch distance

Post by FRN9 » Sat Jun 04, 2011 7:22 pm

DaveBarraza wrote:On the IRT the frog numbers generally went down as low as #5, but this requires 10mph operation.

IND installed #8's and longer.
I feel so ignorant. What do you mean by frog numbers? #8s?

jlr3266
Posts: 550
Joined: Thu Mar 18, 2004 7:32 am

Re: Single switch distance

Post by jlr3266 » Mon Jun 06, 2011 4:00 pm

The numbers designate the size, or length of the switch. The lower numbers are tighter than a #20 or greater "high speed" switch. The effective curve created by a #5 crossover can fit in tight spots, but the trains must run very slowly. This really can affect operations on normal moves.

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