2/6, which were built by a consortium of Stadler, Bombardier and Hellenic Shipyards[i][1] and were put into operation by OSE, between 2003 and 2004.

The trainsets are either standard (560 class) or metre gauge (4500 series), but with the same technical characteristics (capacity, speed, appearance, manufacturers, power supply and number of coaches).

The trainsets are air conditioned and have destination tables, a passenger information system and enclosed toilets, which are easily accessible for the disabled.

For the order of the new trainsets, OSE turned to the Stadler-ADtranz-Scaramanga Shipyard consortium, through program agreements.

[16] In December 2018, GAIAOSE announced a competition for a feasibility study for the conversion of the units of the standard gauge series into fully electric ones[17] The color of the cars consists of a white surface with blue elements on the front and yellow around the doors.