Describe the suggestion
I suggest to add a possibility to create a custom scripts for the trains in packs. You could create a simple library for a programming language (For example lua - It's very simple, but have a lot of possibilities) and content creators can write some scripts for their trains with that library.

Applications of the suggestion
The simple scripts coded by users could move objects of model (So for example user can write a script to open the train doors) by a button, attach or detach a train when player is in the cabin, etc.

This can now all be done in-model

That's an interesting idea