Amtrak replaces 30-year old locomotives with high-efficiency 8,600 hp electric models

http://www.treehugger.com/public-transportation/amtrak-replaces-30-year-old-locomotives-high-efficiency-electric-models.html

Being electric, they have regenerative braking like electric cars and hybrids, but the amount of juice they can return to the power grid (5 MW!) is orders of magnitude higher than anything an EV has to deal with. And the cleaner the power grid gets, the cleaner the operation of these locomotives will be.