I notice that whenever I clear the cache and click restart, TS always restarts in 32 bit mode. Is there anyway to change this to 64 bit by default? At the moment I have to click clear cache and quit, then restart myself in 64 bit mode.
Yep. Go to your \RailWorks folder and locate the RailWorks.exe and rename it to RailWorks32.exe, now locate RailWorks64.exe and rename that to RailWorks.exe Verifying game files may revert this but if you keep them saved in another location as backups too then just copy them back in afterwards. Edit: too - to - meh, not had enough caffeine yet for this difficult spelling lark.
Have a look at post #17 in this thread https://forums.dovetailgames.com/threads/backdated-add-ons.38853/ Peter