SP1900

SP1900 EMU (IKK Train) SP1900 / SP1950 / KRS991 / 1151
SP1900 in East Rail Line at Fo Tan Station
The interior of West Rail Line SP1900
In service	2001-present
Manufacturer	Kinki Sharyo,
Order no.	SP1900, SP1950, KRS991, 1151
Constructed	1999-2000 (East Rail Line) 2002-2003, 2007, 2015, 2016 (West Rail Line) 2003-2004 (Ma On Shan Line)
Entered service	2001 (East Rail Line) 2003, 2008, 2016 (West Rail Line) 2004 (Ma On Shan Line)
Refurbishment	2015-
Formation	12-car (East Rail Line) 7-car/8-car (West Rail Line) 4-car/8-car (Ma On Shan Line)
Capacity	C, H, M, P Cars: 452 D Cars: 430 F Cars: 72 (excluding standing capacity) / 216 (with standing capacity)
Operator(s)	KCR (2001-2007) MTR (2007-present) (Still owned by the KCR Corporation).
Depot(s)	Ho Tung Lau, Pat Heung; Tai Wai (SP1950 trains only)
Line(s) served	East Rail Line      West Rail Line      Ma On Shan Line
Specifications
Car length	24,820 mm (81 ft 5.2 in) (cars with driver cab) / 23,216 mm (76 ft 2.0 in) (other cars)
Width	3,100 mm (10 ft 2.05 in)
Height	3,990 mm (13 ft 1.09 in)
Platform height	1,066.8 mm (3 ft 6.0 in)
Doors	5 (Standard compartment) 2 (First class compartment, only 1 in regular active use)
Maximum speed	Design speed 160 km/h (99 mph) 120 km/h (75 mph) (East Rail Line) ATO limitation 110 km/h (68 mph) 130 km/h (81 mph) (West Rail Line) 100 km/h (62 mph) (Ma On Shan Line)
Weight	37 t (36.4 long tons; 40.8 short tons)
Traction system	Mitsubishi Electric 2-Level 3300V-1200A-IPM-IGBT VVVF inverter 0-200 Hz
Traction motors	Mitsubishi Electric MB-5084-A2 three phase AC Traction motor
Power output	240 kW or 321.8 hp per motor 5,760 kW or 7,724.3 hp (ERL set) 3,840 kW or 5,149.5 hp (WRL set) 1,920 kW or 2,574.8 hp (MOL set)
Acceleration	1.0 m/s2 (3.3 ft/s2) (3.6 km/(h·s) or 2.24 mph/s)
Deceleration	Service: 1.0 m/s2 (3.3 ft/s2) (3.6 km/(h·s) or 2.24 mph/s) Emergency: 1.3 m/s2 (4.3 ft/s2) (4.68 km/(h·s) or 2.91 mph/s)
Power supply	Mitsubishi Electric ATM5 Transformer, 2610 KVA Capacity, PWM 2-Level control, forced air cooling system
Electric system(s)	25 kV AC, 50 Hz Catenary
Current collection method	Pantograph
Braking system(s)	Regenerative and Pneumatic
Safety system(s)	TBL (enhanced with ATP) (East Rail Line), ATO (East Rail Line) SelTrac (West Rail & Ma On Shan Lines)
Coupling system	Tightlock coupling (end cars)
Track gauge	1,435 mm (4 ft 8 1⁄2 in)

The SP1900 EMU / SP1950 EMU or IKK Train (formerly KCR EMU SP1900 / SP1950 EMU; also known as the Millennium Train during the public promotion) is the second model of electric multiple unit of Kowloon-Canton Railway Corporation (KCRC), preceded by the Metro Cammell EMU. The trains of this model are currently in service on the East Rail Line, West Rail Line and Ma On Shan Line in Hong Kong. After the MTR Corporation merger, all SP1900 trains replaced their KCR logos with the MTR logos and added a revised route map in the interior without other major alteration to the stock.

The difference phases of this series of train have entitled with different model numbers but an identical appearance, including: SP1900, SP1950, KRS991 and 1151. Unless specified, the name SP1900 would apply to describe all the model numbers in this article. Another model, 1141A (MTR CRRC Changchun EMU), is similar in design to the SP1900 but is facelifted and built by a different manufacturer.

In 8 March 1999, a Japanese joint consortium of , Kinki Sharyo and Kawasaki Heavy Industries (collectively named IKK) won a HK$3.1 billion worth contract in building the new model of passenger commuter train for the KCR. The contract code of these trains is SP1900, based on the technology of JR East E231 series. KCRC has arranged ninety-six cars of 250, in twelve-car configuration, 8 sets of train joining the train fleet of East Rail Line with the existing Metro Cammell EMU. The SP1900 trains started service on the East Rail Line since 2001. It is known for its quiet design compared to former EMUs.