A train leaves Dhaka with crammed compartments and no room left on its roof in Dhaka, Bangladesh on July 26, 2014. Train terminals witnessed a mad rush as people streamed out of Dhaka to celebrate Eid-ul-Fitr with their loved ones in outlying districts. [Photo/IC]

China's Spring Festival travel rush, believed to be "the largest population migration on earth", has been a severe test for China's railway system. Other nations are also challenged by their own holiday travel rushes; let's take a look at the "train culture" of different countries.