Today I used a bridlepath crossing south of Fenny Compton with a sign All users including pedestrians must contact the signaller. I used the phone at the crossing and was rather surprised that he didn't know which crossing I was calling from as I would expect this to be indicated in the ROC. Also there was no sign with the name of the crossing so I had to describe where I was.
When I returned with a group of 7 I was asked to phone back from the other side to confirm the crossing was clear, so I'd be interested to know if there is a line block for a group of pedestrians. Also how common are these crossings as it is the first time I have seen one?
The signaller is required to ask
ALL callers, including railway staff, where they are calling from (unless they have already said) on all telephone calls when first speaking to them.
One of the reasons for this is because in the past, there have been faults with the telephone system which has misled the signaller and the signaller has made a mistake because of this. Which has serious safety implications.
There is a risk, albeit very small and much less likely than in the past, that wires have been crossed or switches set incorrectly that would mean the phone displays incorrectly. I suspect it’s also second prompt to remind the signaller exactly where they’re dealing with, even if that’s not the main purpose.
I’m not sure if omnibus telephones were ever used for public crossings?
I know of one crossing where railway crossing telephones connect to a BT line and BT exchange equipment. That autodials in to a railway ETD (Extension Trunk Dialling, in other words, a normal railway exchange line) number on the signallers concentrator.
There have been mistakes in the telephone wiring for the voice circuit in the past such that the telephone (not necessarily a crossing telephone, may have been a signal post telephone, I forget the details) indicated the wrong location to the signaller.
But it is also possible with conventional signal boxes or power signal boxes, for a error to be made in the wiring to the illuminated push button or for the labels to be incorrect.
Hence why the signaller is trained not to rely on the telephone system being correct.