Mizoram's Bairabi-Sairang railway line, inaugurated by PM Narendra Modi on Saturday, began at a cost estimate of ₹5,021 crore, which swelled to over ₹8,000 crore due to several challenges. Mizoram lies in zone 5, requiring earthquake-resistant infrastructure. The cost also went up due to structural damage from the landslides and the transportation of machinery and materials to high altitudes.