Abstract: A wrench for rotating a non-circular part on a continuous shaft as tightening the brake on a locomotive. The wrench is made up of a gear box and socket guide containing a two-piece socket gear that can be placed around the part to be rotated. A socket drive gear connected through a power drive insert is provided, and the socket gear can be rotated by a wrench connected to the power drive insert, thereby transmitting power through the socket drive gear to the article being tightened.