Patronage on Bangkok's elevated mass transit system, commonly known as the BTS Skytrain, has grown rapidly since it opened in December 1999 so much so that by the end of the 2000s line extensions and signalling upgrades became essential. With Bangkok Metropolitan Administration (BMA) and Bangkok Mass Transit System (BTS) intent on expanding the system to meet demand as well as increase operational efficiency and redundancy, and optimise maintenance costs, BTS decided to upgrade its signalling system to CBTC and expand its fleet capacity. It subsequently purchased 12 four-car trains from CNR at the end of 2008, which now predominantly serve the Silom Line, while it also extended its existing three-car trains to four-car sets.
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