In 1881, the Assam Railway and Trading Company opened a metre gauge line 65 kilometres (40 mi) long from Dibrugarh to Makum.The network is not broad gauge in many parts and the rail lines are antiquated with speeds at some sections being limited to a maximum of 30 km/h (19 mph).Before the Saraighat Bridge was constructed, passengers had to get down on the Amingaon side of the Brahmaputra and take a ferry across to Pandu Junction from where they could resume their journey.It ascends 6,850 feet (2,090 m) from New Jalpaiguri; the climb begins at Sukna, continues uninterruptedly to Ghum (7,407 ft or 2,258 m) and descends the final 5 miles (8.0 km) to Darjeeling.Timeline of DHR: These are the major railway station which have large numbers of passenger frequencies and stoppages of trains in the zone.
Map of Northeast Frontier Railway zone railway lines