There is a new MTS line from the Beach/Ocean Terminal to a biome across the ocean. I haven't done much exploring outside of the immediate area, but it looks to be Hills/Grassland. As always, the line terminus is safe, but once you leave the station, you're on your own! There is a bed, chest, workbench, and furnace below it.
On another note, as mentioned earlier, MTS started as a spur of the moment thing connecting houses around Spawn points, and areas surrounding it. It was meant to be very simple. However, as with most things, as it grows it becomes more complex. As such, "very simple" has evolved to "as simple as possible" in the grand scheme of things. With each new line, there's at least one new station, and labeling has become a bit tricky. Before, individual rails were designated by who/what was at the end. Now it's to the point where that's not too feasible. So, I went and put up new signs in the front of each station and to the side of each track designating what is what and where it goes. Some stations were renamed in the process.
Moving forward, any station that is located at a specific geographical formation will be named for that formation, and any station that is not will be given a number (think of this type as a hub where future lines will branch from). For example, the station located at Spawn is 'Spawn Station', while the one sitting on the track between my basement and the Ocean Station is simply 'Station #1'. I have a crude map linking everything together and as soon as I figure out the best way to put it in picture format I'll post it.