Tunnel collision is the worst to be feared, Sir".So explained the title character in Charles Dickens' famous short ghost story 'The Signalman', and everyone with a model railway knows that's just as true in miniature form!

Tunnel collision is the worst to be feared, Sir".So explained the title character in Charles Dickens' famous short ghost story 'The Signalman', and everyone with a model railway knows that's just as true in miniature form!