Later on, since December 2004, trains has been refurbished with the replacing of "Adtranz CX-100" into "Bombardier Innovia APM 100", and repainted into a single red stripe pasted on the same blue car.

No refurbishment has been made for Bombardier Innovia APM 100 C801 as it will be replaced eventually at the end of the physical lifespan.

According to the press report, the cracks was discovered "during a routine assessment by Bombardier in 2015" and the issue affected all 19 C801 trains.

It was stated that 12 of them have fixed locally using wielding methods with remaining 7 awaiting for repairs as of time the report was published, having suffered the issue to a lesser degree.

[5] On 7 March 2018, the Land Transport Authority awarded the contract for renewing the Bukit Panjang LRT system to Original Equipment Manufacturer (OEM) Bombardier (Singapore) at a cost of $344 million.

[6] Under the contract, all of the 19 C801 trains would be withdrawn from service, and replaced by Bombardier Innovia APM 300R C801B automated people mover cars.

Individual cars are assigned a three-digit serial number by the rail operator SMRT Trains.