English: Picture of interior of Detroit River railroad tunnel. Caption on opposite side of card states: "INTERIOR OF DETROIT RIVER TUNNEL. / DETROIT, MICH. / The Detroit River Tunnel was built for the M. C. R. R. at a cost of $8,500,000. It is 1 3/8 miles in length. Construction was started in July 1906 and completed July 1, 1910. Electricity, the third rail system, furnishes the motive power for the engines." Opposite side of card also states: "A76549", some kind of postcard inventory number
Date
Address/caption/message side of postcard mentions tunnel's completion in 1910, but before 1923 by the look of the postcard
not necessary; published before 1923, but if not, no copyright is asserted on either side of card, so the copyright expired in any event
Licensing
Public domainPublic domainfalsefalse
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{{Information |Description={{en|1=Picture of interior of Detroit River railroad tunnel. Caption on opposite side of card states: "INTERIOR OF DETROIT RIVER TUNNEL. / DETROIT, MICH. / The Detroit River Tunnel was built for the M. C. R. R. at a cost of $8,5