EMD F125

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EMD F125
Metrolink F125 905.jpg
SCAX 905, the first F125 delivered to Metrolink, unveiled at Los Angeles Union Station.
Type and origin
Power type Diesel-electric
Builder Electro-Motive Diesel, Caterpillar, Inc., Progress Rail Services
Order number Metrolink: 40
Model F125
Build date 2015-present
 • AAR B-B
 • UIC Bo′Bo′
Gauge 4 ft 8 12 in (1,435 mm)
Wheel diameter 40 in (1,016 mm) (New)
Minimum curve 250 ft (76 m) radius/ 23°
Wheelbase Locomotive: 42 ft 4 in (12.90 m) (between truck centers)
Truck: 9 ft 7 in (2.92 m)
Length 69 ft 0 in (21.03 m)
Width 10 ft 0 in (3.05 m)
Height 14 ft 6 12 in (4.432 m)
Axle load 71,250 lb (32,318 kg)
Adhesive weight 100%
Loco weight 285,000 lb (129,274 kg) (Nominal)
Fuel type Diesel
Fuel capacity 2,350 US gal (8,900 l; 1,960 imp gal)
Lubricant cap. 180 US gal (680 l; 150 imp gal)
Coolant cap. 291 US gal (1,100 l; 242 imp gal)
Sandbox cap. Four boxes
@ 6.25 cubic feet (177 liters) each
Prime mover Caterpillar C175-20
RPM range 800-1800
Engine type 45° V20, four stroke cycle
Aspiration Turbocharged
Displacement 105.8 liters (6,460 cu in)
Alternator Kato AK30-8
Traction motors EMD AC Traction Motors,
model A2921-5
1,000 hp (750 kW) each
Cylinders 20
Cylinder size 5.29 liters (323 cu in)[1]
Transmission AC-DC-AC
MU working Yes
Train heating Locomotive supplied Head end power (inverters rated between 600-1000 kW)
Loco brake Dynamic / Regenerative / Electropneumatic / Blend Brake
Safety systems Crash Energy Management (CEM) Technology
Positive Train Control (PTC)
Performance figures
Maximum speed 125 mph (201 km/h) (Optional)
100 mph (160 km/h) (79:22 gear ratio)
Power output At Alternator: 4,560 hp (3,400 kW)
At Wheels: 4,000 hp (3,000 kW) max
Tractive effort Starting: 71,000 lbf (316 kN)
Continuous: 47,000 lbf (209 kN) @ 32 mph (51 km/h)
Factor of adh. 4.014
Brakeforce 47,200 lbf (210 kN) from 20 mph (32 km/h) to 1 mph (1.6 km/h)
Operators Metrolink (Southern California)
Number in class 40
Numbers 903-942
Official name EMD F125
Nicknames Spirit
Current owner SCRRA

The EMD F125 Spirit is a four-axle passenger diesel locomotive manufactured by EMD for the North American market. It is powered by a Caterpillar C175-20 V20 diesel engine rated at 4,700 hp (3,500 kW). The locomotive is capable of traveling at a maximum in-service speed of 125 mph (201 km/h) pulling consists of up to 10 cars. It is EMD's first new passenger locomotive since the EMD DE30AC and DM30AC, and EMD's first domestic passenger locomotive in 15 years.

Features of the F125 include EPA Tier 4 emissions compliance (with exhaust after-treatment), AC traction systems, extended-range blend and dynamic brakes with HEP regeneration capabilities, advanced crash energy management (CEM) technology, and a streamlined body design, designed by Vossloh Rail Vehicles of Spain.[2] The locomotive is equipped with a Nathan AirChime K2 horn placed on top of the locomotive (as opposed to the usual placement under the locomotive for other rolling stock)


The Los Angeles commuter rail agency Metrolink is the launch customer for the EMD F125, with an order of 40 total. The cost of the base order of 10 units with an option of additional 10 was estimated at $150 million, with delivery commencing in 2016.[3][4] The base order was signed on May 31, 2013 for 10 locomotives with an option for additional 10, [5] which has since been exercised.[6] Additional orders were exercised as funding became available. They will replace the EMD F59PH and EMD F59PHI.

The first locomotive, SCAX 903, began testing in the first quarter of 2016. The bulk of the order was expected to be delivered by April 2017,[7][8] but as of June 2017, 13 locomotives have been delivered. The first one delivered, SCAX 905, was unveiled on July 18, 2016 at Los Angeles Union Station during a special event,[9] and had its first mainline run on June 10, 2017.


  1. ^ "C175-20 Prime Mover Specifications". Caterpillar Inc. n.d. 
  2. ^ a b "Locomotive Capacities and Specifications". EMD. Retrieved June 16, 2017. 
  3. ^ Bowen, Douglas John (December 20, 2012). "EMD gets Metrolink Tier 4 locomotive order". Railway Age. Retrieved May 27, 2016. 
  4. ^ "Metrolink to buy newest, cleanest locomotives" (Press release). Los Angeles: Metrolink. December 18, 2012. 
  5. ^ "Metrolink orders EMD passenger locomotives". Railway Gazette International. June 1, 2013. 
  6. ^ "Metrolink receives critical funding commitments for low-emission Tier 4 locomotives" (Press release). Los Angeles: Metrolink. February 10, 2014. 
  7. ^ Jeon, Yena (January 24, 2014). "F125 Tier-4 EMD Status Report". Metrolink. Retrieved May 27, 2016. 
  8. ^ "First Metrolink Tier 4 locomotive completed" (Press release). Los Angeles: Metrolink. January 29, 2016. 
  9. ^ Templeton, Dan (July 19, 2016). "Metrolink F125 locomotive unveiled in Los Angeles". International Railway Journal. Retrieved December 4, 2017. 

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