Will you let me know if you can open the savegame? 128britain
The transmission line on top is what you can do. You can build ground level transmission lines and transformers, and tunnel in straight lines (essentially, any building of tunnels done in above ground view will not crash the game)
The transmission line on bottom is what will crash the game. You cannot extend the tunnel or build an underground transformer. I misspoke earlier, ctrl+click will *not* crash the game. Extending a tunnel once ctrl+click has been used *will* crash the game.
Btw, your signalling videos are really fun. Looking forward to when you make the next one