Approach and Entrance to new River Tunnel, Detroit, Michigan in 1910 - Vintage Railway Tunnel Postcard - Michigan Central Railway Tunnel

Front: Approach and Entrance to River Tunnel, Detroit, Mich. 
Back: The Detroit River Tunnel has the unique distinction 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. Construction was started on October 1, 1906, and completed on July 1, 1910. The length from portal to portal is 1 3/4 miles, and from the 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 $8,500,00. 
Unmailed:
Condition: Good with some aging 
Publisher: Hiawatha Card Co. 
Color hand tinted

**Our vintage postcards may have signs of wear or production imperfections.  Bending, foxing, soft corners or tears will be noted in the description; photos are part of the descriptions. Questions welcome. Thanks for shopping!