Amtrak Cities Sprinter

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Siemens ACS-64
Amtrak Cities Sprinter
Northeast Regional 152 (12384830114).jpg
Amtrak ACS-64 #600 leading Northeast Regional train #152 near Odenton, MD on February 8, 2014
Type and origin
Power type Electric
Builder Siemens Mobility
Order number 70
Build date 2012-
UIC classification Bo'Bo'
Gauge 1,435 mm (4 ft 8 12 in)
Trucks Siemens model SF4
Wheel diameter 1,117 mm (43.98 in) (new)
1,041 mm (40.98 in) (worn)
Minimum curve 76 m (249 ft 4.1 in)
Wheelbase 9.9 m (32 ft 5.8 in)
(bogie centre distance)
Length 20.32 m (66 ft 8 in)
Width 2,984 mm (9 ft 9.5 in)
Height 3,810 mm (12 ft 6 in) (excluding pantograph)
Axle load 54,250 lb (24.61 t)
Weight on drivers 100%
Locomotive weight 215,537 lb (97.766 t)
Electric system(s) 12 kV 25 Hz AC Catenary
12.5 kV 60 Hz AC Catenary
25 kV 60 Hz AC Catenary
Current collection
Traction motors 3-phase, AC, Fully Suspended, Siemens built (Norwood, Ohio)[1]
Head end power 1,000 kW (1,300 hp) 3-phase, 60 Hz, 480 VAC, 1000 kVA
Transmission Pinion Hollow Shaft Drive w/ Partially Suspended Gearboxes
Multiple working Yes
Performance figures
Maximum speed 125 mph (200 km/h) Service
135 mph (220 km/h) Design[2]
Power output 6,400 kW (8,600 hp) Maximum (Short-Time)
5,000 kW (6,700 hp) Continuous
Tractive effort Starting:
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)
Continuous (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
2.99 (33.4%)
Locomotive brake Regenerative braking, NYAB Electro-Pneumatic Cheek Mounted Disk Brakes[3]
5,000 kW (6,700 hp) Maximum[4]
Train brakes Electro-Pneumatic[5]
Safety systems FRA standards
Operator(s) Amtrak
Number(s) 600-669
Delivered 2013-2015 (Projected)[7]
First run February 7, 2014
Sources:[8] except where noted

The Amtrak Cities Sprinter, or ACS-64, is an electric locomotive designed by Siemens Mobility for Amtrak. The locomotives are to operate on the Northeast Corridor (NEC) and the Keystone Corridor, replacing the railroad's existing fleet of AEM-7 and HHP-8 locomotives.[9] The first ACS-64 entered service in February 2014; deliveries will last until 2015.


Amtrak ACS-64 #600 leading its first revenue trip on February 7, 2014
Amtrak ACS-64 #601 being delivered to Transportation Technology Center, Inc. for testing on June 8, 2013.

In October 2010, Amtrak ordered 70 locomotives at a cost of US$466 million, to be delivered beginning in February 2013.[10] 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: #600 and #601 at the Transportation Technology Center in Pueblo, Colorado, and #602 on the NEC.[12][13]

On February 6, 2014, Vice President Joseph 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]

Unit 600 entered service on February 7, 2014, on Northeast Regional train 171 from Boston to Washington, D.C. Deliveries will proceed at a rate of three per month until the final locomotives are delivered in 2015.[15] As the new locomotives enter service, they will gradually displace the electric locomotives that Amtrak currently uses. The extra six ACS-64 units will be used to increase the number of locomotives available for use at any point, and to add more frequent service in the future.[9]


The design is based on the EuroSprinter and the Vectron platforms, which Siemens sells in Europe and Asia.[16] 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.[7][6] The body is a monocoque structure with integral frames and sidewalls.[6]

Vice President Joe Biden sits at the controls of #600 at a publicity event in February 2014

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 6,400 kilowatts (8,600 hp).[16] 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,[17] with trains of eight Amfleets taking two and a half minutes to reach the same speed.[18] They have advanced safety systems, including specialized couplers designed to keep trains from rolling over, jackknifing, or derailing during a collision.[19] 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 utilized to meet HEP needs, further reducing current draw from the grid.[19]

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.[6] 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.[17] 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.[6]

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.[7] Traction inverters are manufactured in Alpharetta, and the traction motors and gear units are manufactured in Norwood, Ohio.[4]


  1. ^ "DOT Announces $562.9 Million Amtrak Loan for 70 Locomotives to Run on Northeast Corridor (Archived)". United States Department of Transportation. June 29, 2011. Archived from the original on 8 July 2011. 
  2. ^ "Siemens AG bags $466-mn order from US railroad company Amtrak". October 29, 2010. Retrieved November 4, 2013. 
  3. ^ "ACS-64 Amtrak Cities Sprinter Electric Locomotive". Siemens. October 2012. Retrieved 4 March 2014. 
  4. ^ a b "ACS-64 InfoGraphic and Fact Sheet". Siemens. Retrieved 4 March 2014. 
  5. ^ Amtrak (February 15, 2011). "PRIIA Specifications for single level cars". Retrieved November 4, 2013. 
  6. ^ a b c d e Latour, Michael (September 2011). "A new face in the Northeast Corridor". Railway Gazette International 167 (9). 
  7. ^ a b c "Amtrak orders Siemens 200 km/h Cities Sprinter locomotives". Railway Gazette International. October 29, 2010. Archived from the original on November 1, 2010. Retrieved October 30, 2010. 
  8. ^ "Amtrak City Sprinter Class ACS64 Electric Locomotive For Amtrak’s North East Corridor (NEC) High Speed Passenger Service". Siemens AG Infrastructure & Cities Sector Rail Systems Division. Retrieved December 24, 2013. 
  9. ^ a b "Amtrak contracts Siemens to supply 70 electric locomotives". Progressive Railroading. October 29, 2010. Retrieved October 29, 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. ^ Amtrak (May 13, 2013). "AMTRAK UNVEILS ADVANCED TECHNOLOGY LOCOMOTIVES FOR NORTHEAST SERVICE; Siemens-built equipment to improve reliability, efficiency and mobility". Retrieved November 4, 2013. 
  14. ^ Matheson, Kathy (6 February 2014). "Biden stresses infrastructure investment in Philly". Associated Press. Retrieved 25 February 2014. 
  15. ^ "NEW AMTRAK LOCOMOTIVES READY FOR SERVICE AND SET TO POWER NORTHEAST ECONOMY" (Press release). Amtrak. 6 February 2014. Retrieved 4 March 2014. 
  16. ^ a b "Siemens breaks into the U.S. long-distance passenger rail market". October 29, 2010. Retrieved October 30, 2010. 
  17. ^ a b Michael Latour (June 2011). "Amtrak ACS-64: Speed, power, efficiency". Railway Age. 
  18. ^ "In-cab video of 601 + 8 Amfleets performing an acceleration test at Pueblo, CO". August 1, 2013. 
  19. ^ a b "Amtrak orders 70 new electric locomotives from Siemens". Trains. October 29, 2010. Retrieved October 30, 2010. 

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