After doing the initial scenarios and getting familiar with controls and some more full runs.. I'm trying to figure out some of the branches and yards.. Is there a way to get to Sunnyside Yard? Only some switches are enabled for player control it seems? There are no player controlled switches to get to that yard nor the other branches, and not routes lead there. So what is the point of that yard, if there are no scenarios with it, not available in scenarios and can't get there.. What am I missing?