(a) A steam collier is a vessel mechanically propelled, and specially designed for the carriage of coal in bulk.
(b) A towed barge is a vessel without sufficient means of self-propulsion and which requires to be towed.
(c) A self-propelled barge is a vessel mechanically propelled of the type specially designed for use in limited coastwise and Great Lakes service and capable of transiting interconnecting canals.
source: CGFR 65-50, 30 FR 16755, Dec. 30, 1965, unless otherwise noted.
cite as: 46 CFR 44.05-5