It’s definitely a bug, I already pointed it out 4 months ago in this thread:
http://www.train-fever.com/forums/topic/bug-impossible-to-build-long-double-track-tunnels/
It happens when the tunnels (or bridges) are curved, long and sloped. And it’s made worst by the unwise lacking of a proper planification tool (that should include building directly two tracks) for the train tracks, requested in vain by many players since the game release…
The only workaround so far is to try a different route with two or more tunnels (or bridges) instead of a very long one. Unluckily, Sometime it’s simply impossible to find a route that can be doubled, and the only solution is to build two separate routes, one for every direction…
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This reply was modified 9 years, 9 months ago by Neldot.