Iranian Rail Network

The Trans-Iranian Railway extends for 1,394 kilometres between the Caspian Sea and Persian Gulf. UNESCO identifies its track gauge—the distance between the rails—as 1,435 millimetres, the gauge commonly called standard gauge. The corridor’s scale and engineering make it central to understanding Iran’s railway history, but it is not a measurement of the entire national network. s1

The International Council on Monuments and Sites, or ICOMOS, identifies the historic endpoints as Bandar-e Torkaman in the northeast and Bandar-e Imam Khomeini in the southwest. Its evaluation also records later railway expansion beginning in the 1940s and continuing after wartime interruption. The historical trunk and subsequent additions must therefore be distinguished when describing the network. s2

The historic railway crosses the Alborz and Zagros mountains as well as forests, plateau landscapes, and coastal regions. UNESCO records 224 tunnels, including 11 spiral tunnels, illustrating how the alignment negotiated difficult terrain. These structures explain the route’s engineering significance more directly than a simple line on a national map. [s1, s2]

For a network overview, the important distinction is between geographical reach and operational capability. A historic alignment establishes where infrastructure was built; it does not by itself establish present-day speeds, train frequency, available capacity, or disruption levels. Those questions require contemporary technical and operating records.

The historic Trans-Iranian corridor

A schematic of the historic corridor’s geographical sequence. Arrows indicate the order of places and landscapes along the route, not scheduled passenger services, distances, or travel times.

ICOMOS’s 2020 evaluation describes the historic line as carrying passenger and freight traffic. It distinguishes maintained infrastructure still in use from redundant buildings and equipment needing conservation or reuse. This creates a practical heritage question: how can modernization preserve historically significant structures and machinery? s2

That assessment is dated evidence, not a current condition inspection. A complete account of the Iranian rail network still needs a verified contemporary map, consistent route-length definitions, and dated confirmation of individual openings and operating connections.