PC Where Is The Master Key For The 38 Stock??

I wanted to do a scenario with the 1938 Stock from Elephant & Castle to Queens Park, and when I went to use the Master Key, nothing happens as you can see in the video. I have used this train many times, and I know how to set it up, but I do not know why this has happened.

 

the click box is just a bit higher to where you were clicking, the area is small on console as will

 

I did it again on foot as opposed to a scenario and it worked just as it should. But I will look at the scenario again soon and see why it might not have worked properly.

 

The masterkey is on the wall behind the drivers seat, to the seats left and below it