Looks like a transformer for a power substation, and was probably a load for a depressed center flat car, or heavy duty flat car. The three, "stacked disc" items, are insulators, there's one missing on the right hand side .
Pete
Go outside and stand by the mailbox and wait for the postman to bring it
Couldn't make a photo but I saw a real one today just exactly like the one pictured here in the thread but it was painted a silver color. It was in an electrical sub-station over behind the college here.