[2] BNSF Railway and Vehicle Projects converted a GG20B to an experimental testbed, for the use of hydrogen fuel cells.

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] In 2023, the locomotive (without its hydrogen components) was donated to the Oklahoma Railroad Museum, which plans on using it as a control car and for electricity generation on the end of its excursion trains.