im not sure about your last question but i would say you dont stand much chance to be honest. Before you proceed onto a level crossing, you must make sure your exit it clear, even if that means letting the car in front of you go and then leave enough space for you before you even start. I live right by a level crossing and you would be amazed at the amount of people who get stuck on the lines because the traffic in front isn't moving - luckily for them, there isn't usually traffic police around!
anyway, if they were on the other side of the crossing and you were on the crossing when they could see the lights were red (from their side) surely this would be enough to make a case for having crossedd on a red light? When you say red light do you mean level crossing lights? if so, weren't you alreted by an amber light first?