Therefore, in 1999, the TRA contracted South Korean manufacturer KOROS to build 56 more cars divided into 14 trainsets.

The last two trainsets (numbered 613 and 614) were produced in Taiwan by Tang Eng Iron Works.

However, unlike its predecessor, the traction system on the EMU600 series uses a insulated-gate bipolar transistor (IGBT) made by Toshiba instead of a gate turn-off thyristor (GTO) on the EMU500 series.

[2] Similar to other local trains, the EMU600 series is fitted with cloth seats running parallel to the center aisle.

[2] The cars originally had one step at each door; this was removed beginning in 2017 by raising platforms and remodeling the interior to turn the trains into a low floor layout for accessibility.