A total of ten Furness Line cargo-liners with ‘Pacific’ prefixes to their names operated in the inter-war years to the Pacific coasts of the United States and Canada, followed by a new sextet of cargo-liners with ‘Pacific’ names in post-war years during a ten year period from 1948 to 1958. At the end of World War I, rapid strides were being made to open up trade using the newly opened Panama Canal between the Northwest coasts of Canada and the United States and Europe. Much refrigerated fruit as well as timber and grain was offering homewards, and the first Furness Line ship to start a regular service was Mongolian Prince of Prince Line when she loaded in the Pacific in September 1921. This service then became fortnightly using London Exchange ex Persiana, London Corporation ex Cynthiana, London Mariner ex Feliciana, London Shipper, and London Merchant as well as some chartered in ships from Manchester Liners Ltd until purpose built vessels were delivered.