"The Great Train Story" at the Museum of Science and Industry is a beloved stalwart of the museum. The $3.5 million train set has 26 separate trains that run for eight to ten hours a day, which means they wear out fast. In 2013, WTTW's Jay Shefsky met William Davidson, the man who repairs the trains and maintains the entire set. Davidson has worked on the set since 2010, and has added his own improvements such as adding lights to some of the buildings. It's a dream job for this model train enthusiast and son of a CTA motorman.
Like the model trains of MSI, real trains wear out and crash, too. Follow investigators as they probe the wreckage of infamous train accidents and watch safety experts test the latest crash preventions designs on the newest episode of NOVA, "Why Trains Crash," airing Wednesday, February 22, at 9:00 pm and available to stream the following day.