The first railway in East Bengal (then part of India, now the country of Bangladesh) opened in 1862 between Jargana and Darsati, a distance of 33 miles (53 km). It was built to a gauge of 5ft 6in (1675mm). This gauge was adopted as standard for the majority of main line railways in the Indian subcontinent, but subsequent railway construction in East Bengal was predominantly of metre gauge.
The Bangladeshi railway network today is extensive but considerable areas of the country are unserved owing to the difficulties of a terrain with many watercourses and land that is frequently flooded. There are several international connections with the Indian network, but only one is used by passenger trains.
Flag image from CIA World Factbook