Electrified railway is 146 km from Tabriz to Jolfa and the tender for electrification of Tehran–Mashhad has been finished according to Railway electrification in Iran. Note: Broad-gauge track is employed at the borders with Azerbaijan Republic and Turkmenistan which have 1,520 mm (4 ft 11 27⁄32 in) broad gauge rail systems; 41 km of the standard gauge, electrified track is in suburban service at Tehran (2007).