Looks like one of the gantries from the Provo pack or similar. Those have a specific safeguard to prevent modifications so Locotool can't identify it. There might be a specific tool or patch that can help, but I'm not aware of what it is.
Right you are, I was trying to prevent it from becoming obsolete but I can't edit it. If anyone has a way to edit it or they have a version that does not go obsolete please reply or message me.
Let the good times roll!
I make locomotion videos! https://www.youtube.com/channel/UCF9pxCq7IJCkrVuIltm0vhQ