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I want to test the .41 patch and try loading my map - map isn't starting after loading bar is at 100%
then I tried to load the older map from my Bugreport - the same error
that was my bugreport where you can find the savegame viewtopic.php?f=7&t=59233
I'am going back to 0.16.36

EDIT: Changed the topic to make it more clear for other user.

Well, the map is quite big, and the fix/migration of the rail signals could be done in more efficient way.
In this case, it actually took me 6 minutes to load the save, so maybe if you tried to wait for it to load it might work.
Once you save it in the 0.16.41, the loading takes normal time as usual.

thx - good to know - can you please add the information to the release 0.16.41 that loading older maps to migration can take up to 10 minutes.

I made an optimisation for 0.16.42 as this would be problem for everyone who will eventually move from stable.