The A-Series of trains have curved roofs for deep tube style stations, and are designed for the Metro (U) network.
A1A stock feature a red livery and each carriage is 19.5 meters long. They have been used on the U1 and U3 lines in the past, but are currently retired.
A1B stock feature a blue livery (the only difference to the A1A stock visually) and each carriage is 19.5 meters long. They were used on the former U3 line (though then it was Line A), but were replaced by A1A stock and were retired.
A2 stock has an even smaller size than the A1 stocks, and are used on the U2 line only.
The B-Series of trains have a much larger size than the A-Series while still being designed for the Metro.
B1 stock are used on the U1 and U4 lines.
2026 JRSC
