I am getting so frustrated with trying to build a metro line. I don't know what I'm doing wrong as I've tried everything that other people have suggested in other threads, I've watched videos over and over and understand what I am supposed to do ( I think) but when trying to just build a simple loop, without a depot involved and staying on the surface in sandbox mode I keep getting "Not enough room to build" error. I have tried different angles to link the tracks. Any ideas what I may be doing wrong as this is stopping me from playing this game at the moment