By the end of the decade, the last railway boom in Canada was underway with the simultaneous transcontinental railway expansions of the Canadian Northern Railway, Grand Trunk Pacific Railway and the National Transcontinental Railway. SCOTIA made significant investments in its properties over a 3-year period, beginning with the Trenton steel mill which saw 2 rolling mills added to the plant in 1910. This was followed in 1911 when the Trenton plant saw a massive investment in equipment to manufacture and machine heavy forgings. In 1912 SCOTIA established the Eastern Car Company and opened a massive factory to build railway cars on the Trenton site adjacent to the steel mill and forge operations, reputedly the largest factory under one roof in the Dominion of Canada.