Fouling points in depots

[ian veitch]

Does anyone know what the minimum distance between rails is required, or the standard for setting fouling marks within depots and sidings?

 

[CEN60]

The Foul Point (FP) is at the point where the running edge of one track to the running edge of the adjacent diverging track measures 1970mm (ie a "standard sixfoot") - however the Clearance Point is a further 5.86m from the FP (or you can use 4.88m if renewing an existing layout - 4.88m is the previous distance) - The point at which you reach the 1970mm dimension will depend on the turnout geometry angle and type of switch geometry (NR56, NR60 & NR60 Mk2)

 

[ian veitch]

I think i understand, do you know where this standard comes from as I've looked on the RSSB website and can't find anything

 

[CEN60]

Off the top of my head I can't remember the standard ref no - I think its in a signaling standard

 

[td97]

I think its in a signaling standard

Notice Board 182. NR document.

The point at which you reach the 1970mm dimension will depend on the turnout geometry angle and type of switch geometry

Generally given as the toe of the points though

 

[Railsigns]

Generally given as the toe of the points though

I don't follow. This would only make sense to me if the question had been about locating the fouling points at a crossover between two parallel lines (with a standard six-foot). At any single set of points, the fouling point is located in the 'vee' of the diverging lines, and nowhere near the toes.

 

[stuving]

Try looking for RIS-0728-CCS "Infrastructure Based Train Detection Systems" in the RSSB catalogue. Issue 1.1 appears to be current, though that 1.1 is still issue 1 which is confusing. That includes the diagrams that go with CEN60's explanation. Also SSP036 02-72 "Track Circuit Clearance Points" and SSP036 Iss1 1 may be of historical interest.

 

[zwk500]

I don't follow. This would only make sense to me if the question had been about locating the fouling points at a crossover between two parallel lines (with a standard six-foot). At any single set of points, the fouling point is located in the 'vee' of the diverging lines, and nowhere near the toes.

I agree with this. On any plan I've seen, the CP arrows are always in the vee.

 

[td97]

This would only make sense to me if the question had been about locating the fouling points at a crossover between two parallel lines

Yes sorry, missed the depot context. FP at toes would be applicable to a crossover with parallel running lines.

 

[CEN60]

Yes sorry, missed the depot context. FP at toes would be applicable to a crossover with parallel running lines.

Correct - but only on the assumption that the sixfoot is 1970mm