 An upgrade of this Soviet-built line dating back to the 1960s, using Russian gauge, began in 2007.In April 2016, an agreement was reached for a technical feasibility study for a proposal to extend this line approximately 100 km to the city of Herat, where it could connect to the standard-gauge line to Iran that is being built.In accordance with earlier decisions, the line is likely to be standard gauge, with break of gauge at Torghundi.