Something tells me a 35 km conveyor belt is moving slowly enough to give you plenty of time to hop off before the big crushing thing.

I think you're probably right, but devil's advocating it, the height of the conveyor belt could vary, and sometimes be high enough off the ground that you couldn't safely jump off. If the run-up to the limekiln at the end of the conveyor belt is elevated for a long enough stretch, you might not realize the point at which you should jump off until it's too late.

Likely true for those longer ones but the site notes a 54 km/h conveyor belt in Germany. That could be a bit risky...

Oh, my. Suddenly I want to go find one of these things and hitch a ride on it.