The indoor exhibits are geared towards young children, and our grandkids (ages 4 & 7) loved it. It included some historical exhibits, but mostly hands-on areas for the kids and a series of model trains. If you're more into the life-size trains, skip the indoor museum and walk the outdoor exhibit of train cars (no ticket required). You cannot climb on the outdoor train cars or enter them (although a few are accessible via scheduled tours), but they are well laid out, with paved sidewalks between the rows of cars. For tickets to the museum, enter the Union Station building on the left-hand side and go to the ticket counter. You can purchase one ticket (and receive a hand stamp) that gets you into all of the museums in the building including the small cowboy museum, the train museum and a vintage car exhibit. We saw it all in about 2 hours.
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