dolly

n.; pl. Dollies 1. (Mining) A contrivance, turning on a vertical axis by a handle or winch, and giving a circular motion to the ore to be washed; a stirrer. [ 1913 Webster ]

2. (Mach.) A tool with an indented head for shaping the head of a rivet. Knight. [ 1913 Webster ]

3. In pile driving, a block interposed between the head of the pile and the ram of the driver. [ 1913 Webster ]

4. A small truck with a single wide roller used for moving heavy beams, columns, etc., in bridge building. [ 1913 Webster ]

5. A compact, narrow-gauge locomotive used for moving construction trains, switching, etc. [ 1913 Webster ]