A train passes the Surami Pass (Poti-Tbilisi). A 4km tunnel, the longest in the Russian Empire, replaced the pass in 1890 to provide easier passage of Baku oil trains. Painting by AA Kiselev, 1891

A train passes the Surami Pass (Poti-Tbilisi). A 4km tunnel, the longest in the Russian Empire, replaced the pass in 1890 to provide easier passage of Baku oil trains. Painting by AA Kiselev, 1891

A train passes the Surami Pass (Poti-Tbilisi). A 4km tunnel, the longest in the Russian Empire, replaced the pass in 1890 to provide easier passage of Baku oil trains. Painting by AA Kiselev, 1891

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