A shipping line is a business that operates ships that it itself either owns or operates for the benefit of the owner. An example of a shipping line would be Mitsui O.S.K. Line (MOL).
Ships of the line were 1st, 2nd, or 3rd-ratedships in the rating system of the Royal Navy.
In the age of sail, after the development of the line of battle tactic in the mid 17th century, and up to the mid 19th century, a ship of the line (of battle) was a warship powerful enough to take a place in the battle line.
Ship of the Line from battleships-cruisers.co.uk - History of the Ship of the Line of the Royal Navy from the galleons of 1650 to the First Rate 120 gun Ship of the Line of 1845, including Caledonia Class, Queen Charlotte, Trafalgar, Victory, Leviathan, Royal Sovereign, Vengeur and Black Prince Class.
One can measure ships in terms of overall length, length of the waterline, beam (breadth), depth (distance between the crown of the weather deck and the top of the keelson), draft (distance between the highest waterline and the bottom of the ship) and tonnage.
Until the application of the steam engine to ships in the early 19th century, oars propelled galleys or the wind propelled sailingships.
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