Yes, the Bakerloo line. It is currently in the Steam Spring Sale for £9.99 instead of £24.99 https://store.steampowered.com/app/2386143/Train_Sim_World_4_Compatible_Bakerloo_Line_Route_AddOn/ It is also available as part of the Train Sim World 2 package for £14.99, if you don't already own TSW2. https://store.steampowered.com/app/1282590/Train_Sim_World_2/
There’s only the Bakerloo line, which was dlc for TSW2. They also have two separate add-ons available for it. See images below.
Bakerloo is actually very well done, apart from the lack of AI traffic on the overground section next to the West Coast Mainline. It captures the atmosphere of the tube nicely, you can almost smell the warm musty aroma and the hot Bakelite. The 1938 stock from Rivet, while not perfect, did get a buff a while back that improved the sounds so is IMHO more pleasant to drive than the 1972 stock.
I wish they'd upgrade it, was wonderful playing it on TSW2 when it first came out and still is fun now but it's starting to show it's age compared to newer releases. Anyways I think something tube related is coming soon because there were a few hints with the whole Goblin Line release, at Barking they've taken time to create custom LU assets for the S-Stock...
The only reason I don’t play it more is the disproportionate AP which always shoves it to the top of your most played route in the profile, for one all stations run the length of the line.
I'm surprised after all these years they haven't included an option to turn scoring off, it's meant to be a sim after all.
I do hate this. Some routes blast others out the water with their AP scores. I think it’s to do with some of them giving you 250 points for stops & others giving you 750. Really throws it out of balance when you get it the wrong way round on an express vs commuter run.
That is how I play too but it still doesn't stop the occurrence of what other players are complaining about.
London Undergroung Joke: I taught my dog to play the trumpet in the London Underground. He went from Barking to Tooting in no time.