Steam Blocked On The Niddertalbahn (resolved !)

TSW4 on PC
On the Niddertalbahn line in the first scenario Hug to trees I am stuck after the stop at Höchst the following instruction for the passage via the route is not displayed
I tried to advance to the stopping point which was validated but then respecting the instructions impossible to finish it

 

Hint: Inspect the tree.

 

I found the tree on the railway, thank's