Is your feature request related to a problem? Please describe.
Performance decreased when there are many trains. All trains within render distance are rendered even if the player can't see them.

Describe the solution you'd like
Cull invisible trains.

Additional Information
Give a bounding box to trains and culling by the frustum from the player.

This would be very helpful. Especially with Shaders the performance drops massively.

This should be fixed in 4.0.0. Please reopen this if you still encounter this issue with 4.0.0, thanks!