Shirgah Railway Bridge (Kaslian River)

North Savadkuh County, Iran

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The Shirgah Railway Bridge spans the Kaslian River in North Savadkuh County, Iran, and exemplifies the reinforced concrete arch engineering of the Pahlavi era. Built as a deck arch structure, the bridge carries railway traffic across the river using a modern concrete form that reflects early-to-mid twentieth-century Iranian infrastructure development. Its design represents the architectural and engineering ambitions of the Pahlavi period, when such concrete arch bridges became symbols of modernization and connectivity across Iran's mountainous terrain.