Just last week I bought these freight cars from fellow rail modeler.
Its Walthers Trainline series, even it got plastic wheel I'm happy with the price.
I'm not a collector or prototype modeler I don't bother with the road names etc. Simply like the color, the red & white match the loco's so I'll change the road name to WOPI LINE :)
The green box & flat car also match the Roco passanger car behind.