PRR K-4 scenario problems

I am new to the sim. DLC today. I have simple controls on. And I can't get the K-4 double header to move forward. Regardless of direction selected it only wants to back up! Am I missing something?
That is in "All Puffed Out". Also "Westward Wanderer" scenario fails to load. How do I re-install or fix the problem?
That is in "All Puffed Out". Also "Westward Wanderer" scenario fails to load. How do I re-install or fix the problem?
