In message , at 19:27:14 on
Tue, 10 May 2011, Steve Gardiner remarked:

Depends what they've done. Passing through a red light has little impact
because the train gets stopped anyway.

Not if the safety device which does that stopping has been disabled.

I don't know what this guy did, but there are breaches which will have
very minor impacts, if any.

And some may cause big impacts (eg with the train in front).
--
Roland Perry