Tugger Line : Tugger line is a wire rope line powered by a motor (pneumatic, hydraulic, or other) and used for the controlled lifting and lowering of light loads around a rig. (RP 54)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}