Alstom Metropolis C830C
Interior of C830C.
In service	26 June 2015 - Present
Manufacturer	Shanghai Alstom Transport (Alstom and Shanghai Electric)[1]
Built at	Shanghai, China
Family name	Metropolis
Constructed	2014–2015
Number built	72 Vehicles (24 Trainsets)
Number in service	72 Vehicles (24 Trainsets)
Formation	3 per trainset Mc1– T–Mc2
Fleet numbers	841 ~ 864
Capacity	931 passengers
Operator(s)	SMRT Trains (SMRT Corporation)
Depot(s)	Kim Chuan
Line(s) served	CCL  Circle Line
Specifications
Car body construction	Welded Aluminium
Car length	23.65 m (77 ft 7+1⁄8 in) (Mc) 22.8 m (74 ft 9+5⁄8 in) (T)
Width	3.2 m (10 ft 6 in)
Height	3.7 m (12 ft 1+5⁄8 in)
Doors	1,450 mm (57+1⁄16 in), 8 per car
Maximum speed	90 km/h (56 mph) (design) 78 km/h (48 mph) (service)
Traction system	IGBT–VVVF (Shanghai Alstom Electrical Equipment OPTONIX)[2]
Power output	1.66 MW (2,230 hp)
Acceleration	1.1 m/s2 (3.6 ft/s2)
Deceleration	1.3 m/s2 (4.3 ft/s2) (Emergency)
Electric system(s)	750 V DC third rail
Current collection method	Collector shoe
Braking system(s)	Regenerative Braking, Air Brakes
Safety system(s)	Alstom URBALIS 300 Moving Block CBTC ATC with subsystems of ATO GOA 4 (UTO), ATP, Iconis ATS and Smartlock CBI
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge

The Alstom Metropolis C830C, together with the Alstom Metropolis C751C are the second generation of communications-based train control (CBTC) rolling stock to be used in Singapore’s Mass Rapid Transit (MRT) lines. 24 trainsets of 3 cars were manufactured by Shanghai Alstom Transport Co Ltd (a joint venture between Alstom and Shanghai Electric),^[3] with deliveries from end June 2014.

The tender for trains under the contract 830C was opened together with another contract C751C for an additional 18 North East Line trains which closed on 18 July 2011 with 5 bids. The Land Transport Authority has shortlisted all of them and the tender results was published on 1 February 2012.^[4][5]

The outside of the train is almost the same as the older C830, with slight differences such as a larger SMRT logo and the look of the train inside. The reserved seats are coloured red to make them more obvious. Navy blue and yellow coloured seats are installed in the driving motor cars (end carriages) while the seats in the middle car are khaki.^[6] The train's system that allows it to move is louder than the C830's, and is identical the one found on the Amsterdam Metro M5 Series.

Other changes include the inner layer of the doors finished in bluish-grey, a new Visual Passenger Information System, similar to the C951, located above the doors and a new gangway design similar to the C751C.

The C830C runs without a driver, using Communications-based train control (CBTC), which does not require "fixed-block track circuits" to find where the train is on the track. Instead, they use "continuous two-way digital communication" between each controlled train and a control center, which may control an area of a railroad line, a complete line, or a group of lines. It has been found that CBTC systems reduce costs for running the system and allow the system to be controlled more easily.^[7]

The configuration of a C830C in revenue service is Mc1-T-Mc2

The car numbers of the trains range from 841x to 864x, where x depends on the carriage type. Individual cars are assigned a 4 digit serial number. A complete three-car trainset consists of one trailer(T) and two driving motor cars(Mc1 & Mc2) permanently coupled together. For example, set 864 consists of carriages 8641, 8642, 8643.