The Alstom Metropolis C830C is the second generation of communication-based train control (CBTC) electric multiple unit rolling stock in operation on the Circle line of Singapore's Mass Rapid Transit (MRT) system. 24 trainsets of 3 cars were manufactured by Shanghai Alstom Transport Co Ltd, with deliveries from end June 2014.

The Circle Line (CCL) is a medium-capacity Mass Rapid Transit line in Singapore. It runs in a loop from Dhoby Ghaut station in the city-centre to HarbourFront station in the south via Bishan station in the centre of the country. It also has a branch to Marina Bay station from Promenade station, which will be extended to HarbourFront station from 2026 to form a complete loop. Coloured orange on the rail map, the fully-underground line is approximately 35.5 kilometres (22.1 mi) long with 30 stations. Travelling from one end of the line to the other takes about an hour.