Two classes of Romanian .....
--> Ζ6 31 73 198 9 000 - 037 which became Ζ6 31 73 199 0 000 - 037 built by UZINA DE VAGOANE ARAD, 1973, Gags
Ζ6 31 73 199 0 001-3 at Sugar Industry of Nea Orestiada
--> Ζ6 31 73 198 9 038 - 049 which became Ζ6 31 73 199 0 038 - 049 built by UZINA DE VAGOANE ARAD, 1973, Gags-v with brakeman's tower
Ζ6 31 73 199 0 046-8 at Lachanokipi, Thessaloniki
One class of Yugoslavian ....
--> Ζ6 31 73 198 9 201 - 250 which became Ζ6 31 73 199 0 201 - 250, built by MASINSKA INDUSTRIJA NIS, JUGOSLAVIJA, 1973, Gbgs
Ζ6 31 73 199 0 132-6 at Nea Magnisia, Thessaloniki
They are easy to recognise from their doors. Romanian cars' doors' lines are vertical while Jugoslavians' are horizontal.
I have photos from many of them, if anyone wants from a specific one let me know.