2009 Signal Control Table

[Peter]

Dear Peter,
Thank you very much for your comments. I have few clarifications. Kindly clarify it
1. Overlap is not consider for shunt routes leading to exit signal 405 (overlap is consider for shunt routes only if the exit of the shunt signal is either limit of shunt signal or independent position light signal). So for 416B(M) movements I considered opposing routes as 353B(S), 371B(S), 373A(S).

It depends what principles you are following (and you will have declared this on your answer in the exam). For UK mainline, the requirement is given in NR/L2/SIG/30009/E440 and talks about overlaps beinn requried where there is a shunt move up to a "destination signal". This term is defined in section 5.5 as "The destination signal may be a shunt signal, a main signal or a limit of shunt." You would of course have to determine the length of that overlap and hence what points it would need to lock so possibly affecting what is required as opposing locking.

2. I considered opposing route as 371B(S), 373B(S) also because if the movement is overrun it makes head on collision with 416B(M) movements.
Kindly correct me if I am wrong.
Regards,
NJK

I assume you mean 371C(S) and 373B(S). The destination for these is the Up Main platform. Opposing locking does not consider the effect of signal overrun. In this case would render the layout very restrictive. If it were the case that moves into the UM were not desirable with the route from 416 into the Up Branch platform, you would need to include 365C(M) and you would effectively be saying that the overlap for 407 should be longer.

Hope that helps.

Peter