The Royal Hudsons are a series of semi-streamlined 4-6-4 "Hudson" type steam locomotives owned by the Canadian Pacific Railway (CPR) and built by Montreal Locomotive Works (MLW). The engines were built in 1937. In 1939, King George VI allowed the CPR to use the term after Royal Hudson number 2850 transported the royal train across Canada with no need of replacement. These locomotives were in service between 1937 and 1960. Four of them have been preserved. No. 2839 was used to power excursions for the Southern Railway Steam Program between 1979 and 1980. No. 2860 was used for excursion service in British Columbia between 1974 and 1999, then again between 2006 and 2010. Royal visit In 1939, King George VI and Queen Elizabeth visited Canada, arriving at Wolfe's Cove, Quebec, on 17 May 1939. This was the first time that a reigning monarch had visited Canada. The King and Queen took a tour of the country by rail. The CPR and the Canadian National Railways (CNR) shared the honours of transporting the royal train across the country, with the CPR undertaking the westbound journey, from Quebec City to Vancouver. The steam locomotive that the CPR used to pull the train was numbered 2850, a 4-6-4 built by Montreal Locomotive works. Specially painted in silver and blue, the locomotive ran across Canada, through 25 changes of crew, without engine failure. The King, somewhat of a railbuff, rode in the cab when possible. The King was so impressed with the performance of 2850 and its class, that after the tour, the King gave the CPR permission to use the term "Royal Hudson" for the semi-streamlined locomotives of the class (numbered 2820–2859, 2860-2864 were built one year later as Royal Hudsons) and to display royal crowns on the running board skirts. This was the only time a locomotive outside of the United Kingdom was given royal status by the reigning monarch. Regular service The CPR owned a total of 65 class H1 Hudsons built by MLW. Classes H1a and H1b, numbered 2800–2819, were not semi-streamlined and were not "Royal" Hudsons. The Canadian Pacific Railway owned 30 class H1c Royal Hudsons, numbered 2820–2849, built in 1937, 10 class H1d Royal Hudsons, numbered 2850–2859, built in 1938, and five class H1e Royal Hudsons, numbered 2860–2864, built in 1940. The class H1c and class H1d Royal Hudsons were used in passenger and freight service in the