Just Cause 3 – Soap Box Car Location (Endless Runner). This Secret Soap Box Car Location is reached without any story progress, counts towards feat fetish
One of the feats for the “Feat Fetish” achievement / trophy, is the endless runner challenge which requires you to find and ride the soap box car.
You can get this box car through story progression after act 1. But it can also be found in the middle of nowhere in the woods on top of a huge downhill track.
N40 49.210 E5 40.64
In order to pass this feat, you only have to ride the soap box car for about 70 metres, everything after that is a bonus and you can test how far you can make it without crashing.