I like the laser beam suggestion, would it have to be on the head of a fricking shark that was strapped to the train?
All the talk of bunnies at the start of the thread reminds me of the book of bunny suicides - an over priced stocking filler from last year. Well worth a look if you happen to see it in a book shop (although i'd save the money and just look through in the shop as it won't take you very long).
All sorts of things conspire to stop trains in the uk but more often than not the biggest problems seem to be greed and apathy. Our drivers often go on strike because they want more money to start and stop a train (not sure that it is that tough) and if anyone has ever waited for a train late at night, you'll know that sometimes they just don't seem to run the services at all and offer nothing in the way of an explanation.