Trainspotters Photo Challenge Guide – Forza Horizon 4. Our Forza Horizon 4 Trainspotters Photo Challenge Guide details how you can complete the new photo challenge in Forza Horizon 4. Location of Viaduct in Forza Horizon 4. This week’s challenge needs you to take a picture of your car with the Glenfinnan Viaduct in the background. Here's the Forza Horizon 5 Star 27 mural location, as well as what you need to do to complete the challenge. The Mural Compass is one of the photo challenges in Forza Horizon 5. You're tasked Steam Version. Steps To Access Save Files Folder. Press Win + R. Copy and paste the following into "Run" window. C:\Program Files (x86)\Steam\userdata\. Note: In case if you didn't change the default Steam installation folder. Sort by "Date Modified", and open the first recent folder (mine is "162934955", because of AccountID number, which you BXLGQ.