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|Locale||Assam and Tripura in India|
|Operator(s)||Northeast Frontier Railway|
|Line length||412 km (256 mi)|
|Number of tracks||1|
|Track gauge||1,676 mm (5 ft 6 in)|
|Old gauge||Metre Gauge|
|Electrification||Not electrified / Diesel operated|
The Lumding–Sabroom section is a railway line under Lumding railway division of Northeast Frontier Railway zone of Indian Railways. It is a single 1,676 mm (5 ft 6 in) broad gauge track from Lumding in Nagaon District of Assam state to Agartala in West Tripura district of Tripura state. The 43 km long 1,676 mm (5 ft 6 in) segment from Agartala southwards to Udaipur, Tripura was completed in 2016 and became operational on 23 January 2017. The remaining 70 km long track to Sabroom at the bank of Feni River at Bangladesh border is expected to be completed by 2020.
Railway service was established in Tripura in 1964 by constructing metre gauge track from Lumding to Dharmanagar and Kailasahar in Tripura but the track did not connect the state capital Agartala. The foundation stone of the 119 km Kumarghat-Agartala railway line project was laid in 1996. The 87 km long segment from Lumding to Agartala became operational in 2008. It was a metre gauge single track without electrification and was converted to 1,676 mm (5 ft 6 in) broad gauge in 2016. A new 43 km long track was laid from Agartala to Udaipur, Tripura in 2017. The remaining 70 km long track to Sabroom at the bank of Feni River at Bangladesh border is expected to be completed by 2020.
The line is being extended 70 km southwards from Udaipur to Sabroom on the bank of Feni River at India-Bangladesh border. The track may be extended further to Chittagong port which is 75 km from the India-Bangladesh border. A branch line from Agartala to Akhaura in Bangladesh, is under construction. This line will reduce the distance between Kolkata and Agartala to about 500 km, from current about 1500 km via Guwahati.