The Amtrak Cities Sprinter or ACS-64 is an electric locomotive built by Siemens for Amtrak. The ACS-64 was designed to replace Amtrak's existing fleet of AEM-7 and HHP-8 locomotives on the Northeast Corridor and Keystone Corridor.
The first ACS-64, numbered 600, entered service on 7th February 2014, with 70 units ordered. Deliveries of the locomotive will last until 2015 at the rate of 3 per month.
They are able to operate from the 25 kV 60 Hz, 12.5 kV 60 Hz, and 12 kV 25 Hz power supplies used on the Northeast Corridor, and have a maximum power of 6,400kilowatts (8,600 hp). The locomotives are capable of accelerating 18 Amfleet cars to a maximum speed of 125 mph in a little over eight minutes, with trains of eight Amfleets taking two and a half minutes to reach the same speed. ACS-64s have advanced safety systems, such as specialized couplers designed to keep trains from rolling over or derailing during a collision.
The design is based on the EuroSprinter and the Vectron platforms, which Siemens sells in Europe and Asia. Significant structural changes to the design were made to comply with American crashworthiness requirements, including the addition of crumple zones and anti-climbing features as well as structural strengthening of the cab, resulting in a heavier locomotive than the previous models. The body is a monocoque structure with integral frames and sidewalls.
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