Actually, that's a hybrid locomotive, which is also in development:"Tree Hugger" switcher. Get it?What's a genset switcher?UP genset switcher
No? The batteries inside the locomotive power the wheels. When the batteries are low, the generator kick in to charge it up.
http://ge.ecomagination.com/site/products/hybr.html
A genset is actually a locomotive that uses several (usually three, IIRC) smaller engines (something you'd find in a semi truck or Caterpillar and actually often made by Cummins or Caterpillar) instead of one gargantuan prime mover. Locomotives used in switching rarely require their full power output, so a genset allows greater efficiency by only running what is needed and not having the friction and fuel usage of keeping a much larger engine in operation all the time.
http://www.uprr.com/newsinfo/attachments/m..._kit/genset.pdf
http://www.uprr.com/newsinfo/releases/envi...0522_iden.shtml
http://www.trainweb.org/gensets/railpower.html
Gensets appear to be winning over the hybrids because of their lower cost and their reduced maintenance costs compared to replacing batteries. Still, you'd think with all of the starting up and slowing down involved in switching, a hybrid would win out. Time will tell.
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