The first of the new C151C trains, which feature tip-up seats, went into service on 30 September 2018, from Ang Mo Kio station.
New trains with tip-up seats will be able to carry 100 more passengers if activated, increasing peak capacity by 6%.
The LTA has called for a tender for 12 new trains, and has asked the manufacturer to include tip-up seats and Wi-Fi infrastructure in the design.
