Before becoming like this the railcar was painted red-white (NOTE:one bogie-an original one-is next to it).The other bogie is also somewhere in Lavrio area.
The rebuilding-repairing was so bad that the front door was covered.SO IT IS NOT A TRAILER.Moreover,,it seems that the railcar had serviced (even as a trailer) until Uerdingens were withdrawn.That's why the numbering goes like that.
Photos from Panoramio-Google Maps
http://www.panoramio.com/
Σ.Π.Α.Π. FOR EVER