Last year someone on IOW recommended the Museum of Transportation on the west side of St Louis. Features a small display of cars & a LARGE display of retired train cars & locomotives. If you're a train fan, I highly recommend it. Volunteers take you on a walking tour at regular intervals. Our guide was a huge train fan, very knowledgeable & very friendly. He was thrilled that we kept asking him questions about the various cars on display. We went there after lunch & spent the entire afternoon.