Under the contract, Mitsubishi Electric will replace the current gate turn-off thyristor (GTO) power modules with insulated gate bi-polar transistor (IGBT) power modules. The upgrade will reduce energy consumption and extend the life of the trains, which entered service in 1997, by reducing the size and weight of the traction modules.

Mitsubishi Electric is responsible for supplying and installing the new traction equipment, as well as testing the trains and assisting with the certification process. Mitsubishi Electric says that produces will be sequentially delivered after equipment for the first two trains is certified.