The first passenger diesel locomotive order by Amtrak in 15 years - the SC-44 - has now entered production. Amtrak was the launch customer for the SC-44 placing an order for 32 units; the order was upped to 58. These locomotives will be distributed between various state operations : 20 to California, 8 to Washington State, 2 to Missouri and 28 to Illinois. In 2015 MARC ordered 8 units to replace the AEM-7 fleet that it still maintains. The Charger is powered by a 4,400 hp Cummins QSK95 prime mover which meets EPA Tier 4 emissions. They also feature AC traction and regenerative breaking that augments the HEP.