Train freezing and red signals problem

[a33ure]

This forum is pretty old, but still

I played Transport Giant for many years, tried many versions. Now i think i use the latest GOG 2.30.

But in sandbox game i still encounter a problem. When there are many routes connections etc. the trains freeze on some routes in front of red signal or just on route. And in front of red signal the path is actually clear ant to restart the train - you need to rebuild the track changing turns. Sometimes train reacts to other route that is underneath in tunnel, while those routes aren't connected at all and should not block one another. Someone knows what logic is in this ? How to create muliple routes without freezing trains? How to bypass this bugs? Why some routes react to tunnels underneath and some don't? How to unfreeze trains without rebuilding the routes? How to make those red signals on emty routes green again?