Korail Class 311000

Korail Class 311000/312000
Class 311000 (1st generation) train 311-27 (ex-Class 5000 train 5-28) at Singil Station
In service	1996-present
Manufacturer	Hyundai Rotem (then Daewoo Heavy Industries, Hyundai Precision & Industries, Rotem)
Constructed	1989 (five trailer cars in trains 311-39~311-41) 1st generation: 1996-1999 2nd generation: 2002-2004 3rd generation: 1st batch: 2005-2006 2nd batch: 2012-2014 3rd batch: 2015-2016
Refurbishment	2004-2006 Class 319000 & Class 321000: 2008 (trains 5-79~5-80 & 5-86~5-92)
Number built	1125 1st generation: 415 2nd generation: 240 3rd generation: 1st batch: 260 2nd batch: 104 3rd batch: 90 (more cars TBD)
Number in service	1st generation: 403 2nd generation: 240 3rd generation: 1st batch: 260 2nd batch: 102 3rd batch: 90
Number scrapped	2 (cars 5719/5119)
Formation	10 cars per train TC-M-M'-T-M-T'-T-M-M'-TC
Fleet numbers	Trains 311-01~312-00 (formerly trains 5-01~5-92)
Operator(s)	Korail
Depot(s)	Guro, Byeongjeom, Imun, Siheung
Line(s) served	Seoul Subway Line 1
Specifications
Car body construction	Steel
Car length	19.6 m (64 ft)
Width	3.12 m (10 ft)
Height	3.8 m (12 ft)
Doors	4 per side, 8 per car
Maximum speed	110 km/h (68 mph)
Power output	4,400 kW (5,900 hp)
Acceleration	3.0 km/h/s
Deceleration	3.5 km/h/s (service) 4.5 km/h/s (emergency)
Electric system(s)	25kV 60Hz AC 1.5kV DC
Current collection method	Overhead
Safety system(s)	ATS
Coupling system	Shibata-type
Track gauge	1,435 mm (4 ft 8 1⁄2 in)

2004-2006

1125

The Korail Class 311000 trains, some train of which were formerly identified as Korail Class 5000 trains, are commuter electric multiple units in South Korea used on Seoul Subway Line 1. Class 311000 trains were manufactured and delivered between 1996 and 2006, and again from 2012 to 2014 to expand service on the Gyeongbu Line and the Gyeongwon Line, and to replace older trains (1st and 2nd batch Class 1000 trains).

As numbering spots in the 311000-series run out, the newest Class 311000 trains have sporting numbers in the 312000 series.

The Class 311000 cars are arranged in 10-car trains; there is a reduction in the motor car/trailer car ratio. Details of the car types of each train are listed below:

3110XX/3120XX - Tc (trailer driving car with SIV, air compressor, and battery)
3111XX/3121XX - M (motor car with inverter and controller)
3112XX/3122XX - M' (motor car with pantograph, transformer, inverter, and controller)
3113XX/3123XX - T (trailer car)
3114XX/3124XX - M'
3115XX/3125XX - T' (trailer car with SIV, air compressor, and battery)
3116XX/3126XX - T
3117XX/3127XX - M
3118XX/3128XX - M'
3119XX/3129XX - Tc

Trains 311-01~311-12, 311-14~311-15, 311-17~311-34, 311-36, 311-42~311-47, and 311-49~311-59 use Toshiba GTO-based VVVF controls with active cooling, while trains 311-13, 311-16, 311-35, 311-37~311-41 and all 3rd and 4th generation trains use IGBT controls with passive cooling through a heat pipe.

Power output on the Class 311000 trains is greater than that on the Class 1000 trains. The trains are equipped with regenerative braking, reducing energy consumption and simplifying train inspection. The trains feature a more powerful air conditioning system than that on the Class 1000 trains.

Older Class 311000 trains used an ivory-colored interior with a long sheet prior to their overhauls. All trains now use a white interior. LED panels are installed on the top of each car older than train 311-83 that show announcements; trains 311-83 and beyond have LCD monitor displays that show advertisements along announcements. The end cars have a space for wheelchairs.