A surviving stretch of the old Oklahoma Railway Company line in the north of the city, run as a working railway museum by a group of dedicated volunteers. Over fifty pieces of rolling stock, including a couple of operational steam and diesel locomotives, are kept in the shed and pulled out for occasional weekend excursions along a 5 km section of track.
Open weekends, April to October. Pair it with the nearby Frontier City theme park or the OKC Zoo. Tickets cheap; ride days even better.