From Iletsk a short branch line, rather more than three versts in length, proceeds to the Iletsk salt mines. Running eastwards and crossing the Ilek river from the right to the left bank by an iron bridge 105 sagenes in length it reaches Aktiubinsk, a district town in Turhai province. At this stage the railway traverses the main watershed of the Ural, Temir, Kubele and Embi rivers, arriving at the Kum Asu pass across the Mugodjarski range. The passage of the line through the mountains, extending 26 versts and a veritable triumph of engineering, imposed a severe test upon the constructive ability of the railway staff. Beyond the range the line turns southward following the valleys of the Bolshoi, Mali Karagandi and Kuljur rivers until, 600 versts from Orenburg, it arrives at Lake Tchelkar. The line now runs across the Bolshiye and Maliye Barsuki sands, where there is abundance of underground fresh water, to the northern extremity of the Sari Tchegonak inlet on the Aral sea, where it descends to sea-level moving along the north-eastern shore. The military depôt at Kazalinsk--sometimes called Fort No. 1--now approaches. This point founded in 1854 has lost its exclusive military character, ranking merely among the district centres of the Syr Daria province. Thirty-six versts from Kazalinsk, at the next station Mai Libash situated in a locality quite suitable for colonisation, a branch line, 4 versts in length, links up the important waterway of the Syr Daria with the Orenburg-Tashkent system, extending the facilities of the railway to shipping which may be delayed through stress of bad weather in the gulf or through inadequacy of the draught over the bar at the mouth of the river.