Forget about Harry’s Hogwarts Express. Forget about those Railway Children, and Thomas the Tank Engine. Forget about The Polar Express too. The best books about trains are ones involving dirty deeds done dirty cheap. For more than a century, mystery writers have been drawn to trains, railways and stations because they are wonderful places to set a crime - hordes of strangers, multiple destinations, people fleeing from the past or looking for a fresh start. You may never make eye contact with a fellow train passenger again after reading some of these thrillers.