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The second category of coastal and short-sea steamship was the cargo liner which often combined the carriage of freight with passengers. Such shipping was deployed in more or less regular services, offering merchants and traders a schedule of rates, and accepting highly heterogeneous cargoes ranging fron the common domestic necessaries to raw materials, semi-manufactures and finished products.
Cargo liners include vessels in short-sea and coastwise trades.
While the quote above is from a chapter entitled The coasting and short-sea trades, the book in general and other sources make it clear that cargo liners include seagoing vessels that traded all over the world.
It appears that passenger capacity was common but not necessarily present in all cargo liners.
Colliers are not included in the category; it seems more applicable to general merchandise as well as raw materials.
Tramp steamers are differentiated from cargo liners.
Ocean liners, primarily designed for the transport of passengers, do not fit within the category even though virtually all carried some freight.