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EMD F125 "Spirit" Diesel-Electric Passenger Locomotive
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. The base order was signed on May 31, 2013 for 10 locomotives with an option for additional 10,  which has since been exercised. 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, 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, and had its first mainline run on June 10, 2017.

EMD F125 Overview
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
Configuration: ​
 • AAR B-B
 • UIC Bo′Bo′
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Wheel diameter: 40 in (1,016 mm) (New)
Minimum curve: 250 ft (76 m) radius/ 23°
Locomotive Wheelbase  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 1⁄2 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 capacity: 180 US gal (680 l; 150 imp gal)
Coolant capacity: 291 US gal (1,100 l; 242 imp gal)
Sandbox capacity: 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)
Locomotive 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) 
Maximum speed: 100 mph (160 km/h) (79:22 gear ratio)
Power output at Alternator: 4,560 hp (3,400 kW) 
Power output at Wheels: 4,000 hp (3,000 kW) max
Tractive effort Starting: 71,000 lbf (316 kN) 
Tractive effort Continuous: 47,000 lbf (209 kN) @ 32 mph (51 km/h)
Factor of adhesion: 4.014
Brakeforce: 47,200 lbf (210 kN) from 20 mph (32 km/h) to 1 mph (1.6 km/h)
Operator: Metrolink (Southern California)
Number in class: 40
Road Numbers: 903-942
Official name: EMD F125
Nickname: Spirit
Current owner: SCRRA

See also:


EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives

C175-20 (50 HZ) Overview

Engine Model: C175-20 SCAC, V-20, 4-Stroke Water-Cooled Diesel
Compression Ratio: 15:03:01
Aspiration: Turbo Aftercooled
Governor Type: ADEM™ A4
Fuel System: Common Rail
Bore: 6.89 in
Displacement: 6456.31 in³
Stroke: 8.66 in

Minimum Rating: 3150 kVA
Maximum Rating: 4000 kVA
Voltage: 3300 - 13800 Volts
Frequency: 50 Hz
Speed: 1500 RPM
Height - Maximum: 150.7 in
Length - Maximum: 330.6 in
Width - Maximum: 127.7 in

Progress Rail logo
SCAX 905, the first EMD F125 delivered to Metrolink, unveiled at Los Angeles Union Station, July 18, 2016.

SCAX 905, the first EMD F125 delivered to Metrolink, unveiled at Los Angeles Union Station, July 18, 2016.

By Andrew - Metrolink F125 # 905, CC BY-SA 2.0,

C175-20 SCAC, V-20, 4-Stroke Water-Cooled Diesel
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