The Acela is Amtrak's flagship high-speed service along the Northeast Corridor in the Northeastern United States between Washington, D.C. and Boston via 13 intermediate stops, including Baltimore, New York City and Philadelphia
Acela carried more than 3.4 million passengers in fiscal year 2016; second only to the slower and less expensive Northeast Regional, which had over 8 million passengers. Its 2016 revenue of $585 million was 25% of Amtrak's total.
The Acela's speed is limited by traffic and infrastructure on the route's northern half. On the 231-mile (372 km) section from Boston's South Station to New York's Penn Station, the fastest scheduled time is 3 hours and 30 minutes, or an average speed of 66 miles per hour (106 km/h).
Along this section, Acela has captured a 54% share of the combined train and air market.
The entire 457-mile (735 km) route from Boston to Washington takes between 6 hours, 38 minutes and 6 hours, 50 minutes, at an average speed of around 70 miles per hour (110 km/h).
The present equipment (the Acela Express Trainset) will be replaced by new Avelia Liberty trainsets, beginning in fall 2023.
The new trains will have greater passenger capacity and an enhanced active tilt system that will allow faster speed on the many curved sections of the route.
The design was based on locomotives Siemens created for use in Europe and Asia, but with changes to comply with American standards. The ACS-64 is built at the Siemens factory in Florin, California, located outside of Sacramento.
The first 70 locomotives were built for Amtrak to replace the railroad's fleet of aging AEM-7 and unreliable HHP-8 locomotives. The first ACS-64 entered service in February 2014 and deliveries continued until August 2016.
SEPTA Regional Rail in Southeastern Pennsylvania operates a fleet of 15 ACS-64s since August 2018, on the agency's commuter rail routes.
The locomotives 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 6,400 kilowatts (8,600 hp). The locomotives are designed to be capable of accelerating 18 Amfleet cars to maximum speeds as high as 125 mph (201 km/h) on the Northeast Corridor in a little over eight minutes.
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