I know the difference between animated and interactive.
It's a problem on some routes though. My watering points on Donner have the link placed correctly, I've gone into the editor and looked, but they won't water my Brit-Kits Heavy Mike for instance.
I've had the same problem with watering points on HSC.
I don't own the S.P. Cab Forward, so I couldn't say if that engine will take water on Donner Pass, at the original watering points.
The Brit-Kits Mikado will take water just fine on the RW&A, as will Mikes little Conni.
When I placed the RW&A water tower in Castle Rock, it would water Mikes Consolidation. When I placed other watering points, it would not. Those watering points had the link placed on the track.
I couldn't find anything in a search, but I have heard of this watering problem before. Some watering points and some engines don't seem to get along for some reason. Or it's the route.
