David is looking into this issue with the timetable guy!
It affect 137-337.ttl file.
This goes for all holidays.
"2). In the meantime, if you browse to your maps\137_337_M37_Spandau\TTData file, and temporarily remove the '137+337.ttl' file, your OMSI will start ok. Or you can do as Joe kindly suggested; launch OMSI, go into options, un-check the box for 'use system time' (or whatever it's called), and set OMSI time to a "non-holiday" date, before loading the Spandau Modern Map.
3). Once we are on a 'normal' day (not a holiday!), you should be able to put the 137+337.ttl file back into the TTData folder and this map should load ok again. (Until we get to the next holdiay!). Rest assured, we will get this fixed though" DavidR