In a downloaded route (Kickstarter Pass), I removed the locomotive that was originally in the session, and downloaded and placed a different locomotive into the train. But I'm not able to make the new locomotive do anything. None of the controls are present. How do I assume control of the new locomotive? And as a related question....if I place more than one locomotive in a route/session I'm creating, how do I determine which of the locomotives will move when I operate the controls? Thank you!