Hossein Ashouri said Iran has extended its railways up to the Afghan border, however the remaining portion within Afghanistan is expected to be completed by 2018, Mehr News Agency reported.
He said the infrastructure in Afghanistan is also ready and two railing blocks are being built in its territory.
Ashouri said sub-grade of one of the tracks has witnessed a physical progress of 50 percent while the second track's sub-grade is only 25 percent complete.
He added that linking Iran's railway system to neighboring countries is a priority for Iran.
Recently, Iran's railway system was linked to Turkmenistan via Inche-Burun border checkpoint, Ashouri recalled, adding the Islamic Republic railways will also be connected to Azerbaijan via Astara border checkpoint within three months.