A cargo transport system includes a cassette for transporting a workpiece and dolly for transporting the cassette. The dolly includes a dolly frame and at least one wheel attached to the dolly frame for supporting the dolly on a surface. A track plate is attached to the dolly frame. The cassette is moveably mountable on the dolly and includes a cassette frame having first and second cassette conveyors engagable with the dolly for moveably supporting the cassette on the dolly. A first drive wheel is attached to the cassette frame between the first and second cassette conveyors. The first drive wheel is rotatable about a first axis of rotation and is operable for moving the cassette along a path-of-travel relative to the dolly. A location of the first axis of rotation is continuously adjustable relative to the cassette frame as the cassette moves along the path-of-travel.