The MTR CRRC Changchun EMU (also known as the TML C-train^{[lower-alpha 1]}) is a model of heavy rail electric multiple units of the Mass Transit Railway in Hong Kong. The 8-car sets are manufactured by Changchun Railway Vehicles for the East West Corridor (Tuen Ma Line), to operate alongside extended SP1900 sets (1151) from the West Rail line. They are currently in service on the Tuen Ma line.

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TML C-train CRRC Changchun EMU 港鐵屯馬綫中國製列車
A MTR Tuen Ma line C-Train train approaching Hin Keng station
Interior of the TML C-train
In service	12 March 2017; 7 years ago (2017-03-12) – present
Manufacturer	CRRC Changchun Railway Vehicles
Order no.	1141A
Built at	Changchun, China
Constructed	2015–2018
Entered service	12 March 2017; 7 years ago (2017-03-12)
Number built	17 sets (136 cars)
Formation	8 cars per trainset
Fleet numbers	D397/D398, D401/D402 to D431/D432
Capacity	C, K, M, P cars: 452 D cars: 430
Operators	MTR
Depots	Pat Heung Tai Wai
Lines served	Tuen Ma line
Specifications
Car body construction	Stainless steel
Train length	195,376 mm (641 ft 0 in)
Car length	25,280 mm (82 ft 11.3 in) (end cars) 24,136 mm (79 ft 2 in) (intermediate cars)
Width	3.1 m (10 ft 2.05 in)
Height	3.99 m (13 ft 1.09 in) (without roof equipment)
Platform height	1,066.8 mm (3 ft 6.0 in)
Entry	Level boarding
Doors	5 sets of 58 inch wide doors per side
Maximum speed	160 km/h (99 mph) (design) 130 km/h (81 mph) (service)
Traction system	Mitsubishi Electric MAP-194-A25V275 IGBT–C/I
Traction motors	20 × Mitsubishi MB-5153-A2 190 kW (254.8 hp) 3-phase AC induction motor
Power output	3.8 MW (5,095.9 hp)
Acceleration	1 m/s2 (3.3 ft/s2)
Deceleration	1 m/s2 (3.3 ft/s2) (service) 1.35 m/s2 (4.4 ft/s2) (emergency)
Power supply	AC-DC-AC
Electric system(s)	25 kV 50 Hz AC overhead catenary
Current collector(s)	Single-armed Pantograph
UIC classification	2′2′+Bo′Bo′+Bo′Bo′+Bo′Bo′+2′2′+Bo′Bo′+Bo′Bo′+2′2′
Bogies	CW6020D (powered), CW6020 (trailer)
Braking system(s)	Knorr-Bremse EP Compact electropneumatic and regenerative
Safety system(s)	SelTrac CBTC
Coupling system	Tightlock
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

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The exterior appearance of the TML C-train is similar to that of the SP1900, with the most notable differences being located at the cab ends. It is painted in the same livery as the R-trains on the East Rail line, the S-trains on the South Island line, and the Q-trains on the urban lines. The latter two were manufactured by the same company.

The interior layout of the trains has been updated, presenting a refreshed version of the SP1900 design. Notable enhancements include the addition of a new dynamic route map display positioned above the doorways. In terms of seating arrangement, the trains now feature rows of three seats between each doorway, contrasting the four-seat configuration found in the SP1900. At the ends of the carriage, two rows of five seats are still present. Another change is the installation of 22-inch LCD TVs, replacing the 15-inch TVs found in the SP1900. Refurbished SP1900 sets have also undergone this upgrade to the 22-inch TVs. While the electrical equipment and propulsion systems resemble those found in the R-Trains for the East Rail line, there are differences between the two.

The stock bid (number 1141A) was won by China CRRC Changchun Railway Vehicles Corporation Limited in December 2013, at a cost of $1.38 billion Hong Kong Dollars.^[1][2] The order was initially for 14 8-car trains, however this was bumped up to 17 8-car trains. This is likely due to the Tuen Mun South extension (still under planning at the time). The first of this train set joined service on the Ma On Shan line in March 2017 and joined service on the West Rail line in March 2020. All 17 trains are running on the whole Tuen Ma line, which fully opened on 27 June 2021.