 Construction work was done on three sections simultaneously.The highest point was at the above of sea level.The first long section Mikhailovo (Khashuri)–Batum was completed on 13 February 1929, the second long section Mingechaur (Mingachevir)–Mikhailovo (Khashuri) was completed on 15 December 1929, and the third long section Baku–Mingechaur (Mingachevir) was completed on 13 February 1930.