Abstract: A walking drag line having an oxcillating wheel segment, a vertical axis roller slot coupling the wheel segment and the walking drag line, a shoe for stepping the walking drag line and a track frame assembly coupling the oscillating wheel segment and the shoe. The crankpin which is journalled into the wheel segment imparts a reciprocal motion in the wheel segment having both horizontal and vertical components. The wheel segment rotates about the axis of a roller axis pin journalled in the vertical axis roller slot and rotates on a track surface of the shoe on the curved outer surface of the wheel segment without slippage.