Lighterman

Watermen's Hall (1778-80), by William Blackburn.

A lighterman is a worker who operates a lighter, a type of flat-bottomed barge, which may be powered or unpowered. In the latter case, it is usually moved by a powered tug. The term is particularly associated with the highly skilled men who operated the unpowered lighters moved by oar and water currents in the Port of London.