There is a room to the left now, and like the ones previous, it has supplies in it. You come across one of the creepier parts of the game so far. Your railcar starts to get attacked by monsters, so keep pushing forward while fighting them all off. Once ready, ram your railcar into the train in front of you on the tracks, and push it forward. In here is a bunch of ammo and a few filters as well as lots of those dog-like monsters.
There is a path to the left where you go through a subway train, but there's nothing but ammo pickups so keep going forward. Fight your way back to the car and pull the lever, immediately put on your mask to protect yourself from the toxic air that comes pouring through. Following the path around you come to a red corridor with a switch at the end that powers up the gate blocking the rails. Hop out and go into the doorway on the right, fight through the mass of spiders collecting ammo/filters as you go. Once back in the railcar, continue down the track until you reach a big door blocking your path. Turn this on to turn the lights in the room on. If you do venture in, there is a circuit box in the first room. Again, unless you need filters or ammo, this room can be skipped. Further down the track we go now! There are spiders out and about now, so turn on the railcar's lights. There's some ammo too, but not enough to warrant visiting here again.
There is another door on the left, and this is just filled with tons of spider monsters. Get back into the railcar now and continue down the track. Hop out to find an Accordion (1/1) to play.