The Michigan Central Railway Tunnel is a railroad tunnel under the Detroit River connecting Detroit, Michigan, in the United States with Windsor, Ontario, in Canada. The U.S. entrance is south of Porter and Vermont streets near Rosa Parks Boulevard. The Canadian entrance is south of Wyandotte Street West between Cameron and Wellington Avenues. It was built by the Detroit River Tunnel Company for the Canada Southern Railway, leased by the Michigan Central Railroad and owned by the New York Central Railroad. The tunnel opened in 1910 and is still in use today by the Canadian Pacific Railway. History Background Prior to the construction of the tunnel, the Canada Southern Railway had several connections to Michigan at its west end, all train ferries. The northern one ran across the St. Clair River, connecting to the St. Clair and Western Railroad. The southern connection crossed the Detroit River south of Detroit, connecting to the Canada Southern Bridge Company at Grosse Ile. Additionally a branch (usually considered the main line) split from the line to Grosse Ile at Essex, running to the Detroit River at Windsor. In 1891, the Grand Trunk Railway opened the St. Clair Tunnel at Port Huron, giving it an advantage over the Canada Southern and its car ferries. The Detroit River Tunnel Company was formed August 15, 1905, as a merger of the Michigan and Canada Bridge and Tunnel Company (in Michigan) and the Canada and Michigan Bridge and Tunnel Company (in Ontario). Construction Construction began in October 1906 under the engineering supervision of the New York Central Railway's engineering vice president, William J. Wilgus. Dredging to construct the tunnel was performed in part by Dunbar & Sullivan, who used a steel dredge (Tipperary Boy) to carry out the work. The Michigan Central Railway Tunnel opened for passenger service July 26, 1910. Freight service began September 15 and on October 16 all traffic began running via the tunnel, ending the use of a train car ferry. From opening it was operated by the Michigan Central Railroad under lease of December 19, 1906. It was the first immersed tube tunnel to carry traffic. On the east (Canadian) side, the tunnel connected to the line that had served a train ferry at Windsor. On the west (U.S.) side, the tunnel connected to the Michigan Central Railroad main line west of downtown (later abandoned east of the junction), and the Michigan Central