Features of the F125 include Tier 4 emissions compliance (with exhaust after-treatment), AC traction systems, extended-range blend and dynamic brakes with HEP regeneration capabilities, advanced crash energy management (CEM) technology, and a streamlined body design, designed by Vossloh of Spain.

The first locomotive began testing in the first quarter of 2016 and was shown to the public on July 18, 2016, at Los Angeles Union Station during a special event,[8][9] and had its first mainline run on June 10, 2017.

The bulk of the order was expected to be delivered by April 2017, but major problems with the locomotives had prevented their full acceptance by Metrolink.

[citation needed] The F125 competes with other Tier 4 compliant locomotives, such as the Siemens Charger series and the MPI MPXpress MP54AC.

Both the F125 and MP54AC have struggled to find customers, unlike the Charger series, which has sold more than 350 units including large orders from Amtrak and Via Rail.