A rail car key adaptor tool made of a shank piece with width less than 1½ inches is connected to another durable material piece in which one material piece is longer than the other at 90 degree on the long side. Top plate with two arms is connected to the shank piece at the edge at 90 degree. A durable triangle piece connecting the two arms next to the shank piece; and a round handle connected at both of arms of the top plate.