13-08-2011, 11:04 AM
Well I don't do this for my day job either, but....
148A tips are very close to the commencement of FJ track which commences just beyond 481 signal, so clearly if there were to be a SPAD and the points had just been called they could potentially be half way across when the train gets there; hence Time of Operation locking look sensible.
To set against that though the only moves up to 481 are PL moves: proceed as far as the line is clear, no faster than 15mph, so one could argue that there is no absolute requirement (I don't have access to NR's current standards). Given that any even minor derailment here would foul the Up Branch, then personally I would certainly provide.
Certainly from IRSE Exam perspective then I definitely would or at least put a note of your rationale for non provision.
148A tips are very close to the commencement of FJ track which commences just beyond 481 signal, so clearly if there were to be a SPAD and the points had just been called they could potentially be half way across when the train gets there; hence Time of Operation locking look sensible.
To set against that though the only moves up to 481 are PL moves: proceed as far as the line is clear, no faster than 15mph, so one could argue that there is no absolute requirement (I don't have access to NR's current standards). Given that any even minor derailment here would foul the Up Branch, then personally I would certainly provide.
Certainly from IRSE Exam perspective then I definitely would or at least put a note of your rationale for non provision.
(11-08-2011, 10:04 PM)Peter Wrote:(11-08-2011, 08:50 AM)SARVESH KUMAR Wrote: Sir,
Please check my point control table of IRSE 2010 for point no. 137 & 148
WITH REGARDS
SARVESH KUMAR
Your post says about 137 and 148, but the attachment only has 148.
Not a bad attempt - you got most of the obvious stuff. A couple of things were there but in the wrong place and there are some things that you have missed..........
One point that I am not sure on (because I am a bit rusty and have not looked it up) is that I think there should probably be some time of operation locking on the points with routes up to 481. Perhaps someone using this in their day job can comment straight off.
Hope this helps.
Peter
PJW