When the simulator is in the "Run" state the <End Run> button is visible. Clicking <End Run> will change the simulator from the "Run" state to the "Return" state 5. In preparation for parking the trains. Trains running small oval or figure-eight will move to a small CCW figure-eight. Similarly trains running a large oval or figure-eight will move to a large CCW figure-eight.
When all trains are following a CCW figure-eight, the simulator will change to the "Parking" state and move the trains, in order, to the parking lot. When all trains are parked, the simulator will return to the initialization or "Stopped" state ready to run another simulation or exit.