lukeimyourfather
It looks awesome
This package contains a coal-mining scene including bucket-wheel-excavators. The scene can be used as a racing track and for other genres. Polycount for the scene about 200k (without the bucket-wheel-excavators)
An Unity5 and Unity 2018 package is included.
You can download all single files and also a Zip-File with all data included (without the unity5 package).