11 coach lengths cannot reasonably be classed as a “starting signal”, surely? That’s what the DRA is for, at the end of the day. The guard shouldn’t be doing the driver’s job for them.
If I SPAD having been given two against a red starter (or if I commit a dispatch irregularity by leaving on two against a green, vice RA, at my London terminal) that’s all on me.
Is there an official definition of a starting signal anywhere?
The definition we've always worked on the basis of at my TOC is simply "A signal at the end of the platform, or close enough to the platform that the train has not fully cleared the platform when stopped at it". Of course, it's one of those typical railway
that's the rule except when it isn't situations - we have one platform where the normal formation that works that route can clear the platform when stopped at it, but a longer train wouldn't be clear. That signal isn't considered a starting signal.
And then we have a couple where the signal is well off the end of the platform (over 300m) but there is an off indicator on the platform and guards are not expected to dispatch unless that indicator is lit. Because of the distance and sighting on that one, drivers are told to expect it to be displaying a red
even though the guard is expected to have checked the off indicator - so it's a starting signal for the guard but not the driver.
However, one thing we have always worked on, consistently, is defining to traincrew what is and isn't a starting signal, and that definition is included in all route learning materials. Demonstrating understanding of where you're expected to check the signal aspect as a guard is a crucial part of our route assessments.