Picking up what I wrote in http://forum.simutrans.com/index.php?topic=9686.0 (http://forum.simutrans.com/index.php?topic=9686.0), I checked for the crash bug in Standard/Pak128 now. It does not happen there, but with Experimental, it happens both with Pak128 and Pak128.Britain-Ex so it should be related to the executable. To sum it up quickly again: if you set the speed bonus in the goods list window so low that the associated speed would reach 0 km/h, the game crashes. I'm still playing with the latest Experimental Windows complete package.
Thank you for the report. I suspect that this might be a divide by zero issue. I shall look into this when I get a chance - thank you again!
Found, and fixed in 10.x - thank you for the report!