PC Hot Axle Scenario Cannot Be Complete, Stuck At Red Signal. Tees Valley

I've been working through the hot axle scenario and as I am about to head to the final objectives I am stuck because the red signal dose not change. TSW2 preserved collection Tees Valley Line.

 

What's the exact name of the scenario please?
I can remeber two of these scenarios, one with Class 20 and the other with Class 31 and you can finish both without problems.

The last guy i helped, just didn't read the instructions and continued driving instead of reversing.
Then he got the red signal and called the scenario bugged.

EDIT:
Did you possibly load a savegame or was it a new session from the start?
Savegames are broken and after reloading, red signals never turn green.