Great Western Express Track Missing

I found the rails missing on Aggregate Industries Chapter 3 - Freight Driver (GWE).

 

Sometimes the Engine (UE4) can fail to load some things. Which results in a outcome like this.
If you restart the Scenario (maybe have to restart the game) you will find that the tracks are indeed there and it was a temporary loading issue due to high stress or whatever.

 

Thx for info.