The argument Virgin had was that if you can overshoot a platform you might overshoot a signal at danger.
Logic that doesn't really stand up when you consider that red signals are preceded by yellow ones to remind you to slow down.
I have heard this at another TOC. The idea being a lot of stations have a signal on the end so if you mess up the approach to the station you could pass a signal at danger. I agree that with a signal you get a yellow as a warning but there may be some merit to the argument with regard to, for example, low adhesion and braking technique.
I think this argument requires the distinction between a ‘fail to call’ and a ‘station overrun’. A fail to call was where the driver had not attempted to stop and an overrun was where they had but overshot for whatever reason.
This is I believe where the idea that if you’d missed your braking point it was better to take the fail to call and not brake was born.
If you attempted to brake and missed the station you can then open yourself to the previous argument of “what if the signal was red”. If you were running on greens and claimed you’d misread the docket or forgot the idea was it didn’t sound ‘as bad’.
When I started driving there was a definite feeling an overrun was viewed as worse than a fail to call.
The other argument I’ve seen advanced by management is the ‘precursor’ theory. Essentially you have a relatively minor incident but if it isn’t fully investigated and you have for example personal issues or an undiagnosed illness that contributed to the incident then a more serious incident could occur that may have been preventable.
A real example I heard was a driver tripped a TPWS grid approaching a buffer. They were c12mph and distracted by a very unusual amount of passenger numbers due to a large event.
The on call manager accepted their version. Didn’t remove them from driving and left their own manager to deal after the weekend. The driver then had a SPAD only a few days later and the original incident was still not resolved. The manager who told me this said that from that point any incident would see you removed from driving immediately until fully resolved.