Some notes:
- North is North, i rotated the heightmap by 45°, and openttd rotated it back.
- I set the difficulty to high, so it may be a bit harder.
- Sorry for the vast amounts of trees, it's realistic, but.. well. it's a bit too much now.
- Mountains are capped at 1600 metres to make the lower mountains visible.
- The actual Semmering Railway goes Gloggnitz->Reichenau->Semmering->Spital am Semmering->Steinhaus am Semmering->Mürzzuschlag
- There should be a rack-railway to Schneeberg, but well.. rocks and snow don't accept passengers.
- Due to realism, there are no oil wells and refineries, the iron ore mines are fairly random, coal mines are quite ok, and the place is full of forests anyway.
- I tried to set Farms livestockier in the mountains and grainier in the plains, but maybe I forgot some.
- The urban areas already have some roads.
Resized Screenshot
Screenshot of the Map
If you're interested in the real railway:
Semmering Railway
Some further infos and pictures
The area at panoramio.com