May be I didn't find the correct building option in the new pak128, but I already read a lot bug reports and couldn't find a similar report.
Therefore I would like to open a new one.
I added a screenshot with all my tries to show what is working and what fails.
Any hint to solve my problem is highly appreciated!!

1.) System specs (CPU, memory, graphics, sound, operating system, preferred screen resolution):
AMD FX(tm)-8350 Eight-Core, 16 GB, NVIDIA GeForce GT 630, Linux x86_64, OpenSUSE 13.2 with latest patches, Kernel 3.16.7,
Latest NVIDIA driver 340.93-36.1, no fixed screen resolution
2.) Simutrans version:
120.1.1, Latest PAK128-2.5.3 (minor changes), downloaded 2015-11-07.
But also tried with pak128-2.5.2
3.) Description of the found problem:
No track can be build on the double high slope tiles.Bridges which are build to half high tracks are too low to be passed by a
second orthogonal track. Feature??
No rail bridge can be build to cross a road/track.Road bridges work well at half slope, double slope tiles and crossing tracks/roads.
4.) How can this problem be reproduced?
Every time PAK128 is used, indenpendent of starting a new games with the present version or
by using an old saved game
5.) What did you/the game do when the problem occurred? n.d.
6.) Effect on gameplay of the found problem? Game not playable, I'm afraid...
7.) Did you discover a workaround for the problem? NO. :-(
8.) Severity of the problem/urgency to fix it?
High, since 128PAK can not be played at all if your are not able to pass tracks/roads...