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In page Islamic Republic of Iran Railways:
"The Trans-Iranian railway traverses many mountain ranges,and is full of spirals and 1 in 36(2.78%)ruling grades.Much of the terrain was unmapped when construction took place,and its geology unknown.Several stretches of line,including tunnels,were built through unsuitable geology,and had to be replaced even before the line opened.Nevertheless,the line was completed ahead of schedule.In recent years the railways have undergone significant extensions including the 1977 linking to the western railway system at the Turkish border,the 1993 opening of the Bandar Abbas line providing better access to the sea,and the 1996 opening of the Mashad–Sarakhs extension as part of the Silk Road railway to link to the landlocked Central Asian Countries.
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