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Specifications
Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Wheel diameter	1,250 millimetres (49 in)
Electric system/s	3,000 V DC
Current pickup(s)	Pantographs
Loco brake	Disc brakes
Train brakes	Air
Couplers	AAR knuckle

Type and origin
Type and origin
Power type	Electric
Builder	Kim Chong-t'ae Works; North Korea
Build date	2011

Sŏngun Red Flag
Sŏngun Red Flag
	Sŏngun Red Flag number 0001 at its rollout ceremony in 2011
Power type
Type and origin
Power type	Electric
Builder	Kim Chong-t'ae Works; North Korea
Build date	2011
Configuration:;
Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Wheel diameter	1,250 millimetres (49 in)
Electric system/s	3,000 V DC
Current pickup(s)	Pantographs
Loco brake	Disc brakes
Train brakes	Air
Couplers	AAR knuckle
Maximum speed
Performance figures
Maximum speed	140 km/h (87 mph) ; continuous: 70km/h
Power output:;
• Starting	4,200 kW (5,600 hp)
• Continuous	2,000 kW (2,700 hp)
Operators
Career
Operators	Korean State Railway
Class	선군붉은기; Sŏngun Red Flag
Number in class	≥3
Numbers	0001-0002; 4071+

The Sŏngun Red Flag (Korean: 선군붉은기, Sŏngun Pulg'ŭn'gi) class is a group of electric locomotives manufactured by the Kim Chong-t'ae Electric Locomotive Works for the Korean State Railway.

Description

On 5 January 2011, the Korean Central News Agency announced that an unveiling ceremony had taken place for a new electric locomotive built by the Kim Chong-t'ae locomotive factory for the Korean State Railway. The primary design goal was to create a locomotive that produces higher power output with lower power usage.^[2]

Given the Sŏngun Red Flag class name by Kim Jong Il (much like the prototype of the Red Flag 1 locomotive was given its name by Kim Il Sung),^[2] the new locomotive is the first to be built in North Korea with asynchronous motors.^[3] Intended for use on freight trains in mountainous areas,^[3] it has a continuous power output of 2,000 kilowatts (2,700 hp),^[4] resulting in a tractive effort nearly 1.5 times that of the Red Flag 1 class, while consuming 50% less power.^[2]

The twin-cab body rides on two two-axle, self-steering bogies with a computerised braking system.^[2] It is equipped with a computerised operation control system with four LCD display screens in each cab.^[5] Although the KCNA report claimed that this was developed domestically, the control system is made by CNR Dalian in China. This is also the case with the asynchronous motors, which are actually Chinese-made Xiangyang induction motors.^[4]

Numbered in the 0000 series, the prototype was painted in a special red and blue paint scheme, but production versions are painted in a variant of the new standard light green over dark green livery; this also differs from the prototype in some details, such as the fluting on the sides and the shape of the upper headlamp.^[6] At least one production unit has been seen numbered in the 4000 series (4071);^[7] this series is allotted to the Ch'ŏngnyŏnjŏl Kinyŏm-class class, although the highest known number assigned to one of those locomotives is 4056; this could mean that production units are now being numbered from 4070. The prototype has been used for a number of special events, including a ceremony in which Kim Jong Il inspected the prototype, saying that "production of modern railway vehicles is important to our railway modernisation policy."^[2] and the opening of the Songdowŏn Line on 23 September 2014 was marked by a special inaugural train pulled by the prototype.^[8] One of the production locomotives has been deployed to the Sinuiju Locomotive Brigade.^[9]