Those are indeed former Chicago METRA trains; MARC got them from Virginia VRE. You can also find these cast-off Chicago "Gallery" bilevel cars in Nashville and Salt Lake City.
Hellenic Railways Organization (OSE)
AEG dmu 520 157/257 on local service 1539 from Halkida departing to Rentis depot .
Athens Larissa Station Attika 11/9/2010
Image copyright: Dimitrios Papadopoulos
Hellenic Railways Organization (OSE)
Stadler GTW 560 107/207 on train to Kiato at Athens station.
Athens Larissa Station Attika 11/9/2010
Image copyright: Dimitrios Papadopoulos