I have spent all day trying to isolate the problem with my route crashing when trying to run the session with 2 newly added assets, tugboats. I have been working on using Vulcan's Tugboat James Hart Kuid2:60238:9045:2. After setting up 1 tugboat with appropriate commands to escort the ore carrier into port, I added a second tugboat. The AI session was working just fine with 1 tugboat. The 2nd tugboat started the session crashes, which I didn't realize at first. I had first tried the "revert changes" and "use changes" after each data base repair with no success. I then deleted the 2nd tugboat I had added and everything worked. The tugboats were placed on completely separate track from each other and from the ore carrier. I could not believe what I was seeing, so I repeated placing and removing the 2nd tugboat into my session several times and sure enough it confirmed the addition of 2 or more tugboats will crash my session!!! How do I approach a fix on this? This problem just doesn't make any sense to me at all.