Concrete ties

I recently purchased a case of Atlas Code83 flex. Either I made a mistake on the order or they sent the wrong stuff. I wanted brown wood ties and they sent concrete ties. Is this stuff good for mainline in 1978?
Anybody want to buy any, I’ve sure got a lot to unload.

Hmmm…got any concrete turnouts too? ;p

As for 1978, i don’t think anyone was using concrete for ties, it’s a realtively new thing for those lines running the faster trains.