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Fortified railroad bridge across the Cumberland River at Nashville, 1864. "Continuing his policy of the offensive at any cost, Gen. John B. Hood brought his reduced army before the defenses of Nashville, where it was overthrown by Gen. George H. Thomas on December 15-16, in the most complete victory of the war. If the date borne on this photograph is correct, it was taken in the course of the battle." View full size. Wet collodion glass stereograph by George N. Barnard.
Looking carefully, this bridge rotates at the center to allow river traffic. Quite possible this was mechanized with steam power. Since Nashville was always a rail center and establish rail road beds remain for a long time, I would say this grade is the same one that is in use today and passes just North of the capital hill and just South of the Bicentennial park and Farmer's Market. The present RR bridge is much higher so no need for the articulated bridge.
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