Rule book module TS1 section 9 clause 9.2:
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It has been a rule since the year dot and I was told that it’s actually required by an act of parliament, one of the Regulation of Railways Acts from 18whatever.
Virtually every modern power operated point machine has an inbuilt FPL so it only becomes an issue having to secure them if the points lose detection.
I'm not sure that the Act of Parliament was that precise, if there was one. Until recently there was an exception 9.2.2 which said: You do not need to apply...9.2.1. to a shunting movement of a vehicle carrying passengers as long as:
you have made sure the points are fitting correctly
a signal is cleared for the movement
you tell the drive the movement must be made at not more than 5 mph
at one time the movement had to be observed if I remember correctly. This was a regular move at Shipley (the old platform 1) where portions of a Morecambe train from Bradford and Leeds combined and at Wakefield Westgate when the Bradford and leeds portions of a London train combined. Note it just says 'a signal' - not a main aspect. Clearing the signal proved the points had fit up correctly due to the detection and if it wasn't replaced the points couldn't be moved under the train.
Of course despatching or shunting a passenger train using GPL or ground disc signal is a different (though related) matter.
As I recall used to happen many times a day at Shipley on calling Leeds-Skipton trains before the platform (s) on the northern side of the triangle were built
Yes correct - Leeds to Skipton trains were shunted back into platform 1 on the authority of a disc signal from April 1966 after 8 points had been fitted with an FPL. From 22 March 1965 these trains had been routed via Bradford Jct and Skipton -Leeds continued to be so, again using a ground disc signal, until the former P5 (now 2) opened in 1979. Since then as a signalman/signaller I have shunted many passenger trains at Shipley and elsewhere on the authority of GPLs or discs in perturbed situations with no seeking of permission from anyone (Control would know of course) - indeed my boss (Area Inspector), if he could be contacted, would have chided me for wasting his time saying 'you know what to do'! Another location was Horsforth (due to a blockage between there and Leeds) - crossover had FPL. However when these moves were likely to be more frequent a Box Instruction and associated instruction in the Sectional Appendix removed the need for the driver to get the signalman's authority before starting from a shunt signal - e.g. at Pontefract Monkhill for late arrival of turnbacks though the driver would sometimes contact the signaller anyway, and in Horsforth's case the signaller had to exhibit a green hand signal from the box instead.
And in the first example the signaller has to get permission from the SSM or Control, they can’t just allow it off their own back.
I can't find that instruction in the Rule Book - though it might be a local instruction. In my day Controllers were not allowed to give permission for anything to do with rules and regulations!