I missed this post so that’s why I’m late replying. A good idea. I think the track should be at least 2 wide and raise the ground up from the start for solving the TT problem. I have a terminus track already to go using 125 it has 6 platforms. They use no Id’s and will work as long as one train going in is replaced by one going out. Also the other end will have to have the same thing happening but with controllers the work with the engine at the other end. If you use trains that use a unit at one end this makes it more difficult but can be done I got a steam train terminus to work with 4 platforms but the train turn around time is quite long and this will also work for diesel units.
Ok I have made a project track 30 X 2, raised the ground up to about the hight to cover a tunnel. Put a 6 station terminus at each end that is runing. A fence to show were the track can be cut for joining. Also a train next to the control track to show which way the engine units are running. Interested in having a go? Mail me
If we want to have a go right,then we have to merge these sectors with standardcoords of the ending and beginning tracks. But now i´ve to get sorted the catenary system to complete. 😉