 However, in 1902 Calthrop left the LNWR to take up a position as General Superintendent of the Caledonian Railway, and in 1908 was promoted to General Manager.In 1910 Calthrop left Britain to become General Manager of the Buenos Aires and Pacific Railway.In 1913 Calthrop returned to Britain and the LNWR, where he was appointed General Manager of the LNWR in succession to Sir Robert Turnbull in 1914.