I am afraid that I still cannot reproduce this: here is the saved game that I produced by following your instructions exactly.
Thanks for uploading this save game!

I thinkI found why it has crashed I emtied save folder in my documents C:\Users\USERNAME\Documents\Simutrans\save then now it works as it should.
Save folder had one .7z file and ĎĎ.sve somehow I dont use that type Ď in my keyboard... But deleting these now app doesnt crashes when I want to save or load game.