The Tamar Valley Line runs from Plymouth, Devon, to Gunnislake, Cornwall, also known as the Gunnislake Branch Line. The line follows the River Tamar for much of its route. Like all railway lines in Devon and Cornwall, it is unelectrified and all trains are diesel-powered. The entire line is single-track past St. Budeaux Junction. The line opened in 1908. There are two viaducts on the line across the River Tavy and Tamar.
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