Alstom Metropolis C751A
The Alstom Metropolis C751A is the first generation of communications-based train control (CBTC) electric multiple unit rolling stock in operation on the North East line of Singapore's Mass Rapid Transit (MRT) system since 2003. 25 trainsets were purchased for the line. Overview. The six-car trains on the North East line are powered by overhead catenary, a first in Singapore's MRT history. Rolling stock on all the other operating lines are powered by a third rail because authorities considered overhead wires to be unsightly and did 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. This rolling stock is the first to have seats of the same colour in every compartment of the train. Alstom was contracted in 1997 and 1998 (as Contract C751A) by the Land Transport Authority (LTA) in Singapore to supply for trains for the North East line. Platform gap reducers were since added to all C751A trains, similar to those on the C830C and C751C. Refurbishment . In December 2018, LTA announced that the C751A trains will undergo mid-life refurbishment works from 2019 onwards. A contract worth $116.7 million was awarded to CRRC Nanjing Puzhen for the refurbishment works. All 25 first-generation C751A trains will be upgraded. The trains' interior, such as seats, panels, and flooring, will be replaced. The LCD screens will be removed. Air-conditioning & ventilation systems will be upgraded. The trains will be retrofitted with new LTA passenger information displays similar to the ones found on newer MRT trains such as the CT251 and the upcoming CR151. The exterior livery design  will be retained with the exception of Land Transport Authority logos. Smaller SBS Transit logos are located on the gangway ends of each car in a similar fashion to LTA's earlier corporate livery designs. Works are expected to be completed by 2024. The first refurbished train set (7013/7014) entered passenger service on 28 February 2022. Exterior design. Red and purple stripes run along the train livery for passengers to easily identify that the trains are operated by SBS Transit. The fleet numbers were placed on the roof above the 1st and 4th doors on each car and three SBS  Transit logos are placed per side per car. C751A trains do not have a middle window cut out unlike the newer driverless trains in the MRT system. This is because it has to make way for the old detrainment ramp, which is not as compact as that of the C751C, C830, C830C and the upcoming C851E. Interior design. The interior colouring scheme of the trains is largely different from other trains in the system, with beige being used for the roof, the emergency communication button and the top ends of the seats, and lavender for the lower parts of the  seats. Wheelchair spaces are located at the 9th and 16th doors of the trains. 36 LCD displays had been installed on the trains but they were deactivated. These trains has two side windows at each end for viewing the tracks. In addition, the C751A trains are also fitted with the following: Driverless operation. The C751A is the first fully driverless heavy metro rolling stock in Singapore, being introduced in 2003. However, in some situations, such as the event of disruptions, SBS Transit hires employees trained to drive the trains manually. The C751A uses the URBALIS 300 moving-block communications-based  (CBTC) Automatic Train Control (ATC) system, which optimizes headway and enables extra trains to be injected automatically into the system at rush hour to increase passenger capacity and reduce congestion. In the depot, trains are also operated in full automatic mode. Communication between the train and the fixed signaling equipment is enabled by the IAGO two-way continuous transmission system. Station-based automatic train supervision ensures a greater degree of availability. Built-in test equipment has also been included, and Eurobalise standards have been adopted for spot transmission. Train Formation. The configuration of a C751A in revenue service is DT -Mp-Mi+Mi-Mp-DT The car numbers of the trains range from 7x001 to 7x050, where x depends on the carriage type. Individual cars are assigned a five-digit serial number by the rail operator SBS Transit. A complete six-car trainset consists of an identical twin set of one driving trailer (DT) and two motor cars (Mi & Mp) permanently coupled together. For example, set 7013/7014 consists of cars 71013, 72013, 73013, 73014, 72014 and 71014.