Hold Your Breath!! We're Going Under Water.

This is a picture of the entrance to the tunnel that runs under the Detroit River so that trains can travel back and forth from Detroit, Michigan in the United States to Winsor, Ontario in Canada. Here are the words on the back of the post card: "The Detroit River Tunnel has the unique disctiction of being the only tunnel of its type ever built. It was constructed in sections, all work being done from the surface of the water without the use of compressed air. The tunnel is operated electrically. Constructioin was started October 1, 1906 and completed July 1, 1910. The length from portal to portal is 1 3/4 miles, and from summit of grade 2 1/2 miles. It was built by the Detroit River Tunnel Company for the M. C. R. R. at a cost of $8,500,000." The M.C.R.R. is the Michigan Central Rail Road. This tunnel gave the New York Central Railroad-controlled company a useful short-cut through southern Ontario connecting Buffalo, Chicago and Detroit. Back on April 5, 2014 I posted a blog about an electric locomotive used for maintaining the right of way in the tunnel: https://www.blogger.com/u/1/blog/posts/2934863145319975648?q=detroit

This post card is part of the Divided Back Era of post cards. This was from March 1, 1907 to 1915. And I can age the card even closer by seeing that the publisher of the card, S. H. Knox was only in business until 1911. So, the tunnel was completed in 1910 and the business (in Buffalo, New York) ended in 1911. That is a very short time frame of 18 months in which this post card was printed.