It does smell a bit like bull excreta
A couple of years ago a whole line of rail cars without an engine rolled away as it picked up speed. It derailed in the city of Devore Ca.
With all of the tank cars filled with hazardous chemicals and flammables, it destroyed a good part of the residential neighborhood.

Years ago when I worked as a diesel mechanic, Someone pushed a coach onto the pit with no transmission, (first off, it was in no danger as the mechanic had chocks to stop it) this loud motor mouth supervisor saw it and thought he was Rambo of Audi Murphy and was going to stop it. He tackled the front tire and wrapped his arms and legs around it, and we all watched as it rolled right over him, it did not slow down a bit.
Once you get something moving, it is not easy to stop it. Idiot....