Siemens ACS-64

The Siemens ACS-64, or Amtrak Cities Sprinter, is an electric locomotive designed by Siemens Mobility for use on the Northeast Corridor (NEC) and the Keystone Corridor in the northeastern United States. 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.

Siemens ACS-64
Amtrak ACS-64 No. 600 leading Northeast Regional train No. 152 near Odenton, MD on February 8, 2014
Type and origin
Power typeElectric
BuilderSiemens Mobility
Order numberAmtrak: 70
SEPTA: 15 (option for 3 additional)
Build dateAmtrak: 2012–2016
SEPTA: 2015–2018
Gauge1,435 mm (4 ft 8 12 in)
TrucksSiemens model SF4
Wheel diameter1,117 mm (43.98 in) (new)
1,041 mm (40.98 in) (worn)
Minimum curve76 m (249 ft 4.1 in)
Wheelbase9.9 m (32 ft 5.8 in)
(bogie center distance)
Length20.32 m (66 ft 8 in)
Width2,984 mm (9 ft 9.5 in)
Height3,810 mm (12 ft 6 in) (excluding pantograph)
Axle load54,250 lb (24.61 t)
Adhesive weight100%
Loco weight215,537 lb (97.766 t)
Electric system/s12 kV, 25 Hz AC, Catenary
12.5 kV, 60 Hz AC, Catenary
25 kV, 60 Hz AC, Catenary
Current pickup(s)Pantograph
Traction motors3-phase, AC, Fully Suspended, Siemens built (Norwood, Ohio)
Head end power1,300 hp (970 kW) 3-phase, 60 Hz, 480 VAC, 1000 kVA
TransmissionPinion Hollow Shaft Drive w/ Partially Suspended Gearboxes
MU workingYes
Loco brakeRegenerative braking, NYAB Electro-Pneumatic Cheek Mounted Disk Brakes
Train brakesElectro-Pneumatic[1]
Safety systemsFRA standards
Performance figures
Maximum speed125 mph (201 km/h) Service
135 mph (217 km/h) Design[3]
Power output6,400 kW (8,600 hp) Maximum (Short-Time)
5,000 kW (6,700 hp) Continuous
Tractive effortStarting:
320 kN (72,000 lbf)
Continuous (5,000 kW (6,700 hp)):
282 kN (63,000 lbf)@40 mph (64 km/h)
89 kN (20,000 lbf)@125 mph (200 km/h)
Short-time (6,400 kW (8,600 hp)):
270 kN (61,000 lbf)@53.5 mph (86 km/h)
115 kN (26,000 lbf)@125 mph (200 km/h)
Factor of adh.2.99 (33.4%)
Brakeforce150 kN (34,000 lbf), 5,000 kW (6,700 hp) Maximum[4]
OperatorsAmtrak, SEPTA
Delivered2013-2018 [5]
First runFebruary 7, 2014 with Amtrak
Sources:[6] except where noted

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 design is based on the EuroSprinter and the Vectron platforms, which Siemens sells in Europe and Asia.[7] 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.[5][2] The body is a monocoque structure with integral frames and sidewalls.[2]

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).[7] 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,[8] with trains of eight Amfleets taking two and a half minutes to reach the same speed.[9] They have advanced safety systems, including specialized couplers designed to keep trains from rolling over, jackknifing, or derailing during a collision.[10] Additionally, the new locomotives are more energy-efficient than those that they replace, and lack dynamic braking grids in favor of 100% regenerative braking, depending on grid receptiveness. Energy generated from the brake may also be used to meet HEP needs, further reducing current draw from the grid.[10]

Each locomotive has two electrical converter units with three IGBT based, water cooled output inverters per converter. Two of the inverters power the traction motors; the third unit supplies head-end and auxiliary power.[2] The HEP/auxiliary inverters are dual-redundant and identical (rated 1,000 kW or 1,300 hp), allowing the locomotive to remain in service should one inverter fail en route.[8] The locomotive bogies are fabricated steel designs, with low-lying traction links and center pivot pin. The traction motors are frame-mounted, with torque transmitted via a hollow shaft drive. Locomotive braking is facilitated by cheek mounted disc brakes on each wheel.[2]

In order to comply with "Buy American" laws, the locomotives are being manufactured at Siemens' factory in Florin, California, with traction and electrical equipment being manufactured at Siemens facilities in Norcross and Alpharetta, Georgia.[5] Traction inverters are manufactured in Alpharetta, and the traction motors and gear units are manufactured in Norwood, Ohio.[4]



In October 2010, Amtrak ordered 70 locomotives at a cost of US$466 million, to be delivered beginning in February 2013.[3] The order was the second part of Amtrak's company-wide fleet-replacement program, after an order for 130 Viewliner II passenger cars was placed in July 2010. On June 30, 2011, US Secretary of Transportation Ray LaHood announced that Amtrak had received a US$562.9 million loan from the federal government's Railroad Rehabilitation and Improvement Financing program for the new locomotives.[11] The additional funding over and above the $466 million will cover capital spare parts and facility improvements to accommodate the ACS-64s.

Amtrak and Siemens Mobility unveiled the first three completed locomotives on May 13, 2013. They were tested during the summer of 2013: Nos. 600 and 601 at the Transportation Technology Center in Pueblo, Colorado, and No. 602 on the NEC.[12][13]

On February 6, 2014, Vice President Joe Biden visited 30th Street Station in Philadelphia to tour ACS-64 #600. In his subsequent remarks he stressed the importance of infrastructure investment as well as the important role Amtrak's new locomotives will play in serving the critical artery of the Northeast Corridor.[14]

Amtrak and Siemens celebrated the completion of the last ACS-64, No. 670, in Florin, California, on June 2, 2016.[15] The celebration concluded with unit No. 670 being towed by Amtrak CEO Joe Boardman's train bound for Washington, D.C. Locomotive No. 670 entered service in August 2016, completing the acceptance of the Amtrak order.[16]


Unit 600 entered service on February 7, 2014, on Northeast Regional train 171 from Boston to Washington, D.C.[17] As the new locomotives entered service, they gradually displaced the electric locomotives that Amtrak had previously operated. The extra six ACS-64 units are to be used to increase the number of locomotives available for use at any point, and to add more frequent service in the future.[18] The final unit, #670, was delivered from Siemens on June 2, 2016,[15] and entered revenue service in August of the same year.[16]

In November 2014, Amtrak named ACS-64 No. 600 the David L. Gunn in honor of the longtime transportation official who has served at many agencies.

In May 2015, ACS-64 No. 642 was painted in a red "Salute our Veterans" scheme, similar to a previous scheme on P42DC diesel locomotive #42.[19]

On May 12, 2015, No. 601 was pulling Northeast Regional No. 188 when it derailed at Frankford Junction in the Port Richmond section of Philadelphia due to excessive speed on a restricted curve.[20][21]

On April 3, 2016, No. 627, pulling the Palmetto, hit a backhoe on the track and derailed in Chester, Pa, killing two trackside workers.[22][23]


In May 2015, SEPTA (Philadelphia's mass-transit authority) approved an initial order for 13 ACS-64 locomotives for commuter service to replace its 7 AEM-7 and single ALP-44 locomotives on push-pull express trains, with an option for an additional five locomotives to be added to the order. On November 11, 2015, Siemens announced that it was awarded the $118 million contract for the initial 13 locomotives.[24][25] The total contract value, including the option for additional locomotives, is worth $154 million.[26][27][28]

On February 29, 2016, Amtrak unit 664 began test runs on SEPTA Regional Rail branches to test the height of the locomotives on SEPTA territory, and to ensure clearance through the Center City Tunnel.[29] After testing the unit on most of SEPTA's lines, it was returned to Amtrak on March 21, 2016, for completion of its acceptance testing.[30] From July 2016 until April 2017, SEPTA leased several ACS-64 units to pull five Amfleet cars and several MARC Train sets as emergency rolling stock after all Silverliner V cars were temporarily pulled from service.[31]

SEPTA's first ACS-64 was delivered on December 14, 2017, by which time SEPTA had increased its order to 15 locomotives.[32][33][34] The first unit entered service on the Paoli/Thorndale Line on July 11, 2018.[35]


  1. Amtrak (February 15, 2011). "PRIIA Specifications for single level cars" (PDF). Retrieved November 4, 2013.
  2. Latour, Michael (September 2011). "A new face in the Northeast Corridor". Railway Gazette International. Vol. 167 no. 9.
  3. "Siemens AG bags $466-mn order from US railroad company Amtrak". October 29, 2010. Retrieved November 4, 2013.
  4. "ACS-64 Info Graphic and Fact Sheet" (PDF). Siemens. Retrieved March 10, 2018.
  5. "Amtrak orders Siemens 200 km/h Cities Sprinter locomotives". Railway Gazette International. October 29, 2010. Retrieved October 30, 2010.
  6. "Amtrak City Sprinter Class ACS64 Electric Locomotive For Amtrak's North East Corridor (NEC) High Speed Passenger Service" (PDF). Siemens AG Infrastructure & Cities Sector Rail Systems Division. Retrieved December 24, 2013.
  7. "Siemens breaks into the U.S. long-distance passenger rail market" (PDF) (Press release). Siemens. October 29, 2010. Retrieved October 30, 2010.
  8. Michael Latour (June 2011). "Amtrak ACS-64: Speed, power, efficiency". Railway Age.
  9. "In-cab video of 601 + 8 Amfleets performing an acceleration test at Pueblo, CO". August 1, 2013.
  10. "Amtrak orders 70 new electric locomotives from Siemens". Trains. October 29, 2010. Retrieved October 30, 2010.
  11. "Amtrak receives $562.9m loan to purchase 70 locomotives for Northeast Corridor". June 30, 2011. Archived from the original on June 30, 2011. Retrieved July 1, 2011.
  12. Siemens USA. "Siemens Provides First Look at New Amtrak Locomotives". Synaptic Digital. Retrieved November 4, 2013.
  13. "New Amtrak Locomotives Advancing in Rigorous Testing Program" (Press release). Amtrak. July 29, 2013. Retrieved March 10, 2018.
  14. Matheson, Kathy (February 6, 2014). "Biden stresses infrastructure investment in Philly". Associated Press. Archived from the original on February 21, 2014. Retrieved February 25, 2014.
  15. "Siemens completes 70th ACS-64 locomotive for Amtrak". Progressive Railroading. June 2, 2016. Retrieved June 3, 2016.
  16. "ACS-64 Locomotives Usher in New Era of Mobility on Northeast Corridor". All Aboard: The Official Blog of Amtrak (Press release). Amtrak. August 2016.
  17. "New Amtrak Locomotives Ready for Service and Set to Power Northeast Economy" (Press release). Amtrak. February 6, 2014. Retrieved March 10, 2018.
  18. "Amtrak contracts Siemens to supply 70 electric locomotives". Progressive Railroading. October 29, 2010. Retrieved October 29, 2010.
  19. "Second Amtrak veterans' locomotive in-transit to Northeast". Train Magazine. May 18, 2015. Archived from the original on July 3, 2015. Retrieved July 3, 2015 via Trains Magazine Newswire.
  20. Nussbaum, Paul (May 13, 2015). "At least 5 dead as Amtrak train derails in Port Richmond". The Philadelphia Inquirer. Retrieved May 13, 2015.
  21. Melissa Gray (May 16, 2015). "Amtrak installs speed controls at fatal crash site". CNN.
  22. Siddiqui, Faiz; Halsey III, Ashley (April 3, 2016). "Amtrak service disrupted in Northeast after derailment; 2 reported dead, 31 injured". The Washington Post. Retrieved April 3, 2016.
  23. Stamm, Dan (April 3, 2016). "2 Die as Amtrak Train Strikes Backhoe Causing Fireball". NBC Philadelphia. Retrieved April 3, 2016.
  24. Worrell, Carolina (November 11, 2015). "Siemens to build new locomotives for SEPTA".
  25. Siemens USA (November 11, 2015). "Siemens to build 13 electric locomotives for the Southeastern Pennsylvania Transportation Authority".
  26. Dan, McQuade (November 11, 2015). "SEPTA Is Buying 13 New Locomotives for $113 Million". Philadelphia Magazine. Retrieved December 6, 2017.
  27. Nussbaum, Paul (May 27, 2015). "SEPTA plans to spend $154 million on new locomotives". The Philadelphia Inquirer. Retrieved May 29, 2015.
  28. "May 2015 Special Agenda" (PDF). Southeastern Pennsylvania Transportation Authority. May 2015. Retrieved July 3, 2015.
  29. "SEPTA testing an ACS-64 in March". Trains News Wire. March 1, 2016.
  30. "Railfan Pictures of the Week - 3/27/2016". The Philadelphia Chapter of the National Railway Historical Society. March 27, 2016. Archived from the original on April 11, 2016.
  31. Smith, Sandy (July 8, 2016). "SEPTA to Add 1,700 Regional Rail Seats Starting Monday". Philadelphia Magazine. Retrieved July 19, 2016.
  32. "Siemens delivers new locomotives to Baltimore, Philadelphia agencies". Progressive Railroading. December 18, 2017. Retrieved March 12, 2018.
  33. "Siemens ships first ACS-64 locomotive for SEPTA". Railway Age. December 7, 2017. Retrieved March 12, 2018.
  34. "SEPTA's first new electric locomotive has pulled into Philly". Curbed Philadelphia. December 15, 2017. Retrieved January 30, 2018.
  35. Gambardello, Joseph A. (July 11, 2018). "SEPTA's new Regional Rail locomotive makes debut". Philadelphia Inquirer.
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