The Railpower GG20BGreen Goat is a low-emissions
diesel hybridswitcher locomotive built by
Railpower Technologies Corp. It is powered by a single
Caterpillar C9
six cylinder inline engine developing 300
horsepower (224
kW), which is also connected to a large battery bank where both sources combine for a total power output of 2,000
horsepower (1,490
kW). To date, there have been more than 50 GG20B diesel-electric hybrid switchers manufactured since their first introduction in 2004.[2]
The locomotive, BNSF 1205, was originally built in 1957 as
Canadian Pacific 8637 (renumbered 1544 in the 1980s), a
GMDGP9 locomotive.[8] In 2006, it was rebuilt into a GG20B for the Canadian Pacific, but was not delivered, due to the cancellation of the order. It was sold to BNSF in 2008, and shipped to the railroad's shops at
Topeka, Kansas for conversion. The diesel generator set was removed, and the fuel cell power unit was installed in its place. Hydrogen storage is in a set of tanks installed in a heavily vented enclosure on top of the locomotive's
long hood, above the batteries.[9] To date, it is the largest land vehicle on earth to be powered exclusively by hydrogen fuel cells.[10]