| Alstom Metropolis C751A | |
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Front of an Alstom Metropolis C751A at Sengkang Depot. |
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Inside an Alstom Metropolis Car on the North East Line. Trains running on this line are driverless and fully automated. |
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| In service | 20 June 2003 - Current |
| Manufacturer | Alstom |
| Built at | Valenciennes, France |
| Family name | Metropolis |
| Constructed | 2000 - 2003 |
| Number built | 150 |
| Formation | 6 per trainset Tc + M + M + M + M + Tc |
| Capacity | 1920 passengers (320 per car) 296 seats (48 per car) |
| Operator | SBS Transit |
| Depot(s) | Sengkang |
| Line(s) served | North East Line |
| Specifications | |
| Car body construction | Welded aluminium |
| Car length | 23.65 m (Tc) 22.8 (M) |
| Width | 3.2 m |
| Height | 3.7 m |
| Floor height | 1,100 mm |
| Doors | 1,400 mm, 8 per car |
| Maximum speed | 100 km/h |
| Weight | 337 tonnes (6 passengers/m2) |
| Acceleration | 1.1m/s2 |
| Deceleration | 1.4m/s2 (Emergency) |
| Traction system | IGBT-VVVF (Alstom ONIX 1500) |
| Electric system(s) | 1500 V AC Overhead catenary |
| Bogies | 16 t per axle |
| Safety system(s) | Alstom's MASTRIA ATP and ATO Alstom's URBALIS ATC/CBTC |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) Standard gauge |
The Alstom Metropolis C751A are the first generation of communication-based train control (CBTC) rolling stock that has been in use in Singapore’s Mass Rapid Transit (MRT) lines since 2003. Alstom was contracted in 1997 and 1998 (as C751A) by the Land Transport Authority (LTA) in Singapore to supply for its North East Line in 2003.
The automated system version, previously known as “moving block systems”, CBTC systems do not require traditional "fixed-block track circuits" for determining train position. Instead, they rely on "continuous two-way digital communication" between each controlled train and a wayside control center, which may control an area of a railroad line, a complete line, or a group of lines. Recent studies consistently show that CBTC systems reduce life-cycle costs for the overall rail property and enhance operational flexibility and control.
A development in Singapore's MRT history, the six-car trains on the North East Line are powered by overhead catenary, in contrast to the train cars on all the other operating lines prior to this, which are powered by a third rail. This was partially because authorities consider overhead wires to be unsightly and it does not allow for trains to be powered using this method on elevated lines. Since this line is the first to be fully underground in Singapore, the authorities had a choice between powering the trains on this line by overhead catenary or third rail. An overhead catenary power supply was decided upon. This is also the first time in the history of Singapore's MRT history that the seats in every compartment of the train are made up of the same colours. 25 trainsets of six cars each were purchased for the North East Line. In addition, due to its driverless configuration, it is a unique type of train where there are windows at the front and back of the train, giving passengers an impressive view as the train speeds through the tunnel. LTA says that they are adding 12 new trains for the North East Line within 5-6 years time.
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Individual cars are given a five-digit serial number by the rail operator, SBS Transit. The car numbers of the trains range from 7x001 to 7x050, where x depends on the carriage type. Because not to confuse with the serial numbers of Kawasaki Heavy Industries & Nippon Sharyo C751B, a 7 will be placed together with the other 4 digits.
So for example an Alstom Metropolis C751A on the NEL (in this case, 001/002), would consist of serial numbers 71001, 72001, 73001, 73002, 72002, 71002.
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