Unless you’re a member of the London Transport Museum and already booked a ticket, you’ve probably missed your chance to join a very unique fantrip. On June 22 and June 23, the London Transport Museum will be operating a train pulled by steam locomotives between the Ealing Broadway and High Street Kensington stations to celebrate the 150th anniversary of the District Line’s opening. In addition, due to the signaling improvements that are underway on the Circle, District, Hammersmith & City, and Metropolitan Lines, the museum expects this to be the last time steam trains will be able to travel in to Central London on the sub-surface lines. Tickets cost 150 GBP (197 USD) for standard class and 180 GBP (236.50 USD) for first class. For more information, please visit https://www.ltmuseum.co.uk/whats-on/events-calendar/heritage-vehicles-outings. And even if you missed out on the opportunity to ride this train, it is expected that you will be able to see it pass by from any of the District Line stations it will pass through on its journeys.