In January 2016, LTA had announced to replace all trains with the new CR151 trains. On 13 April 2017, LTA released a tender for contract CR151, which will be the replacement train for the current first-generation C151 trainsets. For the time being, LTA will work with SMRT to improve the reliability of the 66 first-generation trains with four more trains changed the PMSM motors. On 25 July 2018, the contract CR151 was awarded to Bombardier Transportation at a sum of $1.2 billion, inclusive of a long-term service support package for up to 30 years. 66 CR151 trains will subsequently replace all 66 C151 trains from 2021 onwards while the C151 trains are being decommissioned.