Hi, Dave. I had that happen to me a little ways back. What I did was edit the config file for the route and CHANGE the KUID for the unmovable item to something highly recognizable - like a tree spline, or a line of cars. Then, when you reload the route, you will see what you changed it to. Go ahead and delete it now.
You can either edit in Explorer or use CCP, whichever is your choice.
Bill