If you wish to bypass the long Wienerwald tunnel, you need to get off at St. Pölten and take a different train to Vienna.
If you have a look at a railway map (http://www.bueker.net/trainspotting/map.php?file=maps/austria/austria.gif for example), you will see there is a second line from St. Pölten to Vienna (the tunnel line is still marked as under construction in the map).
The plan now is to find a station along the route of that second, older line and add it as a via point in bahn.de or oebb.at.
On Google Maps I can see that such a a station is Neulengbach. If I enter this station as “via”, I get a connection that is 1 to 2 hours longer than the direct Railjet (8 or 9 hours instead of 7). It of course requires changing trains at least twice.
Hope this helps. There are only two small tunnels on the alternative route (300m long).
Credit:stackoverflow.com‘
5 Mar, 2024
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