After the convert there’s a game model file created, in the model file you have to define the specifications of the model, type, speed, costs and more. Bogies work as separate groups, in the model file you instance the group.
But more about this when we’re ready for the mod tools.
All you need to know now is that the bogie, wheel and everything about the train is in one obj file. After that the train is going to be configured in the model file. The center of each mesh is also needed for animation and positioning. This could change to make it simpler, but currently we’re working with this.