So, I sort of griped about this a bit, but it seems like formation designer cant handle some formations. It seems like while I'm able to sometimes build a formation, I can place it, but as soon as it gets place,it causes a game crash, followed up my even attempting to edit the formation in the formation designer after the crash, causes another crash. They are sometimes not even that complex of a formation either. Example is if I go into and edit this formation, it crashes. Yet it only has 3 different cars and 1 loco type. Yet TSW can handle all of these different formations in one photo, so complexababity isn't the problem... Ism not sure what the exact problem is, but its something that does limit the formation designer, especially with US freight.
Hi Blacknred81 , Please follow our Troubleshooting Crashes & Technical Issues Guide and if you are unable to resolve the issue, the guide will tell you how to contact support.