21Qinghai–Tibet railway
The Qinghai–Tibet railway has to use specially built passenger carriages with an oxygen supply for each passenger because it is a high-elevation railway with tracks laid at more than 16,000 feet above the sea level in some areas.
22Mashriq–Maghreb Express
Between 1950 and 1955, there used to be a train named the Mashriq–Maghreb Express which ran from the westernmost extremity of Pakistan (Koh-i-Taftan in Balochistan) to the easternmost rail extremity at Chittagong in modern-day Bangladesh, stretching at total of 2000km over the Indian Territory.
