Thank you all for looking, and for your kind comments. This train is based on the Harry Potter stories.
The front of the train is the symbol made by Morsmordre spell, which is one of the most terrifying sights, representing that the Death Eaters have struck. It inspires fear and panic into anyone who sees it.

It seemed natural that once the symbol becomes a train, the snake should be Nagini and the crew should be Voldemort and the Death Eaters. The engine represents Nagini transfigured, and that means the train is, perhaps, a horcrux. If it is a horcrux, Voldemort has made himself an easier target in his quest for power and vengeance...
Happy Hallowe'en!
ps too late for the contest but just for fun, the Morsmordre express has had
a baby!
Edited by robuko, 01 November 2009 - 10:06 AM.
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