Okay, so even though Steam Train to Salem is built for a Cthulhu game, it still has some of the more crucial elements, that being the continuous noise of being on a train, like “slow train”, “medium train”, etc. Those are the sounds of being on the tracks that you need. (It also has “frightened passengers” and whatnot when things start exploding.)
For the passenger cars in a more modern context, keep the train sounds going and then I’d add in sounds from Coffee House 2015 (happy rich murmuring, coffee talk male/female, even the musak background music if you like). Steam Train to Salem also has a “crowded carriage” element that’s fairly time-neutral as well.
Headed to Nairobi (from Masks of Nyarlathotep) has a battle on a train, which includes stressed metal element and an excellent explosion one-shot. I also like the “major impact” one-shot from Mech Battle for a crash. While Headed to Nairobi set and Steam Train to Salem both have a train stopping mood/one-shot, they are very much a steam train stopping, and don’t include the metal screeching typical of train brakes.
Alternatively to that, there are a number of sets in the Sci-Fi player that have metal scrapes as an element, such as Abandoned Space Station. Nebula has an element called “hull scrapes and vibration” which has some really good long high-pitched metallic sounds that may suit. And layered into that I have a possible off-the-wall suggestion: Swarm Attack has two elements, “ethereal creature screeches” and “more ethereal creature screeches”. Put those with the hull scrapes/metal scrapes and that might give you the sort of sounds you’re looking for.
(Though @Steve, could we get train brakes, please? At some point in the future? That’d be spiffy!)
For the doors, the Sci-Fi Player has the universal one-shot Airlock Door Open/Closed which sounds reasonably close to pneumatic doors on some trains.
For the station, I’d use Coffee House 2015 again, kicking up the “echoing happiness” very high to get the sense of space, and increasing the crowd noise.
I hope that helps!