Locomotives / Train Sets

Siemens ACS-64

Electric Locomotive

Entry Last Edited: 01/17/2024 | Content ©www.RailRoadJunction.net | The following text is exclusive to this site.
Specifications [+]
The Siemens ACS-64 is a primary mover for AMTRAK high-speed passenger services in the Northeast and operated in smaller numbers by SEPTA.
The ACS-64 is a Siemens Mobility electrically-driven passenger locomotive primarily operated by launch customer AMTRAK of the United States. AMTRAK purchased the initial seventy units of the series (out of the 85 produced in total) with SEPTA (Philadelphia's MTA) securing the remaining fifteen (with an option for three more units). The AMTRAK locos, selected by the company to succeed AEm-7 and HHP-8 lines jointly, were built between 2012 and 2016 (Serial Nos. 600-665, 667-670) while the SEPTA examples arrived between 2015 and 2018 (Serial Nos. 901-915) from the Florin, California manufacturing facility. The series, based in the European market EuroSprinter design modified for use Stateside, is also known as the "AMTRAK Cities Sprinter".

The loco has an overall length of 66.7 feet with a beam of 9.9 feet and a height of 12.5 feet. Weight is 215,537lb. Its configuration follows the European standard with a driving cab positioned at either end of the locomotive. Hinged, rectangular access doors are installed to either side at both ends giving access to the cockpit. The engine room is at center of the rectangular shape with access doors positioned at either end of the long hallway. A lavatory is provided for the driver for long-haul routes.

As an electrically-driven locomotive, the vehicle supports 12kV, 25Hz AC catenary, 12.5kV, 60Hz AC catenary, and 25kV, 60Hz AC catenary electrical systems picked up by the proven pantograph arrangement. The traction motors are 3-phase AC types and fully-suspended. Loco braking is handled by a regenerative system featuring electro-pneumatic cheek-mounted disk brakes while the train is slowed by an electro-pneumatic system itself. Safety systems supported include FRA and ACSES II.

In the AAR wheel arrangement nomenclature, the ACS-64 has a B-B arrangement indicating a pair of identical trucks (Siemens Model SF4 type) with two powered axles each. This provides the locos ability to achieve high-speeds in the passenger-hauling scenario. It can reach speeds of 135 miles-per-hour in testing and is generally operated no faster than 125 mph in service.

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Specifications [ Siemens ACS-64 ]

Siemens Mobility - USA / Germany

United States
2012 - 2018
Production Run

85 units
Production Total
Train driver seating position graphic

Driver Position
20.3m | 66.7 ft
NOTE: May include length of entire train set
97,766 kg
(215,574 lb | 108 US Tons)
Locomotive power source graphical icon
Power Source
Electric arrangement supporting 12 kV 25 Hz AC, 12.5 kV 60 Hz AC, and 25 kV 60 Hz AC overhead lines via pantograph connection.
Engine / Drive Source
Siemens 3-phase, AC, fully-suspended.
Traction Motor / Sets
200.0 kph
(124.3 mph)
Max Speed
Wheel Arrangement
(Loco Facing Left)


Safety Systems
Operating Countries
United States

National flag of the United States
Customers / Operators:
AMTRAK; SEPTA (Philadelphia MTA)
NOTE: Includes both past and present

Image of the Siemens ACS-64

Image of the Siemens ACS-64
Side profile illustration view of the Siemens ACS-64 electric-drive locomotive in AMTRAK livery.
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