GP40WH-2
In 1993, Morrison-Knudsen was contacted by MARC to assemble a fleet of GP40s. These units are called GP40WH-2s. The GP40WH-2 is equipped with a Cummins head-end power generator and is rated at 3,000 hp (2,200 kW), allowing the locomotive to push or pull up to 6 bi-levels at up to 100 mph (160 km/h). The FRA exempted these MARC units from the "triangular light pattern" rule because the engines were ordered with Gyralites before the mandatory use of ditch lights. They are numbered 51 to 69 on the MARC roster and entered service in 1994. They are slated for retirement due to the arrival of new MP36 locomotives. Several of these have been leased by MPI to the MBTA.
Read more about this topic: EMD GP40-based Passenger Locomotives