English: Postcard picture of entrance to Detroit River railroad tunnel, Detroit, Michigan. Caption on other side of postcard (also shown on store web page) states: "HAS THE UNIQUE distinction of being the only tunnel of this type 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 October 1, 1906, and completed July 1, 1910. The length from portal to portal is 1 3-8 miles and from summit to grade 2 1-2 miles. It was built for the M. C. R. R. at a cost of $8,500,000." (sic - punctuation as in original) No publisher information is stated, just "MADE IN USA" down the middle. Stamp portion states "Place Stamp Here" "POST CARD" is stated at top of address side. Light blue ink.
Date
not postmarked, no copyright notice, is of a style published before 1923
not necessary, copyright expired, either because published before 1923 or no copyright asserted
Licensing
Public domainPublic domainfalsefalse
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
Captions
Add a one-line explanation of what this file represents
{{Information |Description= Postcard picture of entrance to Detroit River railroad tunnel, Detroit, Michigan. |Source= eBay store Web page: (image): http://al-g.smugmug.com/photos/436271259_wqniC-O.jpg (description): http://cgi.ebay.com/Entrance-to-Detro