Dc motors wont work on ac of any frequency. Low frequencies used in traction improve the motors' starting torque, and of course this is important.
I've got a very old domestic appliance that claims to handle 25Hz, but where 25Hz was ever found in homes in UK I dont know. I wonder if a few old private gen plants used it at the time, and they thought theyd corner the market, but am far from convinced.
NT