Please Help (Trainz Simulator 12)

Question, help who can...maybe I'm stupid, but let's say I'm running a session of the Motherland route in Trainz 12. I want to put the train on the rails. created Russian compositions, but there are only a few bourgeois ones in the list of compositions. how to switch to my list with Russian lineups??? I don’t see where you can switch to the list of compositions I created ... pops up only one which is the default.