We present a new wide-field map of the radio galaxy 3C 129 and its companion galaxy 3C 129.1 at \lambda = 90 cm .
We see a distinct steep-spectrum feature near the head of 3C 129 , extending in a direction perpendicular to the radio tails .
We propose that this Crosspiece might consist of fossil radio plasma , which has been re-energized by the compression of the bow shock of the supersonically moving galaxy 3C 129 .
One possible origin of the fossil radio plasma could be the tail of a nearby head-tail radio galaxy .
We discuss the implications of , and give testable predictions for , this scenario .