From 1930 onwards, the L.M.S. railway company had embarked on a program of replacement for the fleet of steamers built before the first world war. The Duchess of Montrose in 1930, Duchess of Hamilton in 1932, Caledonia and Mercury in 1934, Marchioness of Lorne in 1935 and Marchioness of Graham in 1936 had been revolutionary and a tremendous investment at a time when shipbuilding work on the Clyde was scarce and prices were low. Additional tonnage was required, however, for the popular routes to Dunoon and Rothesay and in 1936, an order was placed with the Fairfield Company in Govan for two steamers, designed as ferry-class vessels like Marchioness of Lorne, but with higher speed and greater capacity. The new steamers, to be named Jupiter and Juno, were built on the same slipway at the Govan yard. Although named after two steamers of the former Glasgow and South Western Railway Co.,...