I have noticed that trains that are the max 128 track length can be de-rendered if you look away from the back. This can be resolved by adding the create:carriage_contraption to the config of entity culling specifically the tick culling and entity whitelist. Also it would be helpful to add create's contraption chunkloader mod as this would allow for extremely long trains.

I would also like to add that after the latest update create steam and rails and farmers delight may be incompatible. This is causing crashing while holding a train casing and opening the radial menu for different bogeys.