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Re: [Phys-L] train stopping distance


On 2016, Jun 24, , at 14:20, LaMontagne, Bob <RLAMONT@providence.edu> wrote:

Moving tonnage by rail is remarkably efficient.


At one time (presently?) diesel electrics would use engine braking using huge resistors on the top of the engine(1). Replaced by tons of battery would add significantly to that efficiency?


bc has a Prius.


(1) Heard train staff joking about fried birds, possibly was leg pulling.

Fermi question: Is the energy regeneration > the energy to haul the batt. up the Rockies? Is there a crossing weight and advantage?


p.s. I think boat is E > rail. Why so many canals?