The line's most important ships were all sunk during the First World War. After the war four huge replacements for the Minne class ships were planned. Only two of these were built however and the passenger service, which recommenced in 1923, never matched pre-war successes. With first class travel declining the A.T.L. introduced a tourist third class ship in 1925 and for two seasons operated a second. But the line was faltering even before the Wall Street Crash and with the recession of 1931 its remaining ships were laid up or transferred to other IMM lines and it effectively ceased to exist. The American holding company survived until 1936. The SS "Minnewaska" was the last ship the Atlantic Transport Line operated.