They are part of the VAL family of automated, driverless rubber-tired metros developed by the French company Matra.

Within a year of revenue operations, Matra terminated the service contract, removing all maintenance crew.

They filed and won a complaint against the Taipei City Government over contract compensation delay.

Bombardier's contract also involved supplying 101 newly built vehicles to expand the existing fleet.

[4] The VAL 256 cars were also used by O'Hare International Airport's Airport Transit System, albeit with the majority of the seats removed since the system's primary purpose is to move passengers between terminals as well as provide access to the economy parking lots, rental car facility, and the Metra station until it was replaced in 2021.