Delete Interlocking tower, next time I load surveyor, crash to desktop.

Hi all, wondering if anyone has any suggestions. I am having an issue with Interlocking towers. I have remodeled a main station in my route and no longer require a interlocking tower. Any time I delete an interlocking tower though and save. The next time I load into the game it crashes on the surveyor load screen. I have backed up my route and realized the common link was the IT being deleted. Has anyone else had this issue?
 
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