 The locomotive fleet consists of diesel locomotives of the 2TE10L, 2TE10U, 2M62U series, there are also several locomotives of Chinese production CKD9A and Kazakh production TE33A.Shunting work is performed by diesel locomotives TEM2, TEM2U, ChME3.In 1996, Mashhad–Sarakhs extension connected Iran to Turkmenistan,as part of the "Silk Road railway" to link to the landlocked Central Asian Countries.Former states of the Soviet Union have railways using a Russian gauge,thus the Iranian Railways maintain break-of-gauge services at borders to Azerbaijan and Turkmenistan,and beyond brief wide-track rail segments to the border crossing.