The fleet of 104 vehicles was supplied in two orders. The first batch of vehicles (fleet numbers 501–530) were built between 1988 and 1993 and are propelled by chopper control and DC motors designed and manufactured by Garrett Air Research, later supported by ABB. The second batch of vehicles (fleet numbers 531–604), were built between 1995 and 1997 and include 3-phase AC 4-pole asynchronous traction motors and VVVF inverter control using GTO thyristor technology, manufactured by General Electric. Both types of vehicles use electronic sliding pocket doors, air conditioning and braking systems built by Wabtec.
