Wagons derailing on uncoupling

[signalnorths]

I am experiencing certain wagons (Newbouy HTO 21t Hopper and Newbuoy Mineral Rusty, derailing when they are uncoupled .

Does anyone know a solution to this please? I assume some tinkering with a file is needed?

Thanks in advance

Len

[RolandBP]

I have noticed that sort of thing in the past with certain wagons.
What I found helped was to put a brake on some of the wagons, then stretch the train slightly, then uncouple.

Maybe that will help?

Roland.

[skiddaw]

I have had something similar happening with coaches in the past. The coaches flew apart violently when uncoupled.
From memory, it was something to do with the bounding boxes. Reducing them solved the problem.