Sorry, I'm using an automatic translator. I'll try to write as best as possible for the translator.

The "Subway" block, which is the tunnel, could have a circuit network to allow train signaling between levels. For example, I made a stop on the surface, inside the factory, without much space for anything beyond the stop. In the underground, I'm using radar to create a circuit network to carry the signal that there's a train using train gates; if the G signal is equal to or greater than 1, the signal should be red. It works well, but I think it would be more practical if there was a small network between the Subways like the normal entrance.

Another improvement, if possible, would be for the Subway to actually be a station that we could change the name of. What I've been doing to be able to play with multiple destinations is to place a station before the Subway so the train only has to go one Subway ahead after stopping at that station.

Thank you for your mod, it's very fun and cool to be able to take materials directly into the base.