I just bought TS12 as my first time using Trainz. I'm doing the original Norfolk & Western - Appalachian Coal route and the Westbound Merchandise Train session that came with TS12. I'm stopped at a red signal at bluefield east 0004 switch. The bluefield Yardmaster has aleady cleared me to go to bluefield east 0031 switch but the signal is still red. after 2 hours it's still red. How do I get it to change green?