These track shovels are specialy equiped for a chemical waste disposal that has to be secured and redisposed due to pollution of underground water due to this disposal.
This is taking place in Switzerland but I don't remember the exact name of the place.
The place to be secured is covered and machines are working in a secured from outside environment.
I have now found a little more about it......
If you're interested just go to:
www.smdk.chAll specifics will be explained