> > >I always wondered why no-one tried (or maybe they have?) to develop
some
> > >kind of breaking system for RR cars that didn't depend on the wheels
(for
> > >example, solid-fuel rocket motor) that could be used in an extreme
> > >emergency to stop the train QUICKLY. I realize that this is changing
the
> > >subject slightly from the safety concern you mentioned, but it made me
> > >think of it.

This ends up with some kid unbolting the package and attaching it to a
bicycle, for a new urban legend  =8-0