The Barauni–Katihar, Saharsa and Purnia sections of the Barauni–Guwahati line connects Barauni, Saharsa, Purnia and Katihar in the Indian state of Bihar .

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Barauni–Katihar, Saharsa and Purnia sections
View of Katihar yard
Overview
Status	Operational
Owner	Indian Railways
Locale	Bihar
Termini	Barauni Katihar
Stations	27
Service
Services	Barauni–Katihar Samastipur–Khagaria Khagaria–Saharsa Saharsa–Purnia Saharsa–Forbesganj Katihar–Jogbani Katihar–Teznarayanpur
Operator(s)	East Central Railway, Northeast Frontier Railway
Technical
Line length	185 km (115 mi)
Track gauge	5 ft 6 in (1,676 mm) broad gauge
Electrification	Yes
Operating speed	110 km/h
Route map Legend km km to Muzaffarpur & Darbhanga 146 Samastipur to Barauni 138 Bhagwanpur Desua to Barauni–Gorakhpur, Raxaul & Jainagar lines 131 Angar Ghat 124 Narhan to Mokama–Barauni section 119 Rusera Ghat Barauni 00 116 Mabbi NH 28 111 Naya Nagar Bihat 05 108 Barepura Tilrath 08 101 Hasanpur Road Begusarai 15 97 Sashan Lakho 23 95 Garhpura Danauli Phulwaria 28 91 Somra Pranpur Lakhminia 33 86 Salauna Sanaha 44 79 Imli Sahibpur Kamal 48 75 Paharaja Gangur Umesh Nagar 54 71 Olapur Khagaria 61 Mansi 69 NH 31 Chedbanni 74 Maheshkhuntt 80 Badlaghat Gauchari 84 Koshi River Pasraha 92 Dhamara Ghat Bharat Khand 98 Koparia Narayanpur 104 Simri-Bakhtiarpur State Highway 58 Baba Raghuni Thana Bihpur 112 Saharsa Karu Khirhar Nagar Saharsa Kacheri Baijnathpur Panchgachhia Methai Garh Baruwari Dauran Madhepura Veena Ekma Budhma Supaul Bhairopatti Kadampura Deenapatti Tharbitta Murliganj Baijnathpur Andoli Rupauli Saraygarh Janki Nagar Narayanpur Murli Harapatti Raghopur Rambisanpur NH 31 Pratapganj to Lattipur Lalitgram Kharik 120 Chhatapur Road Naugachhia 128 Narpatganj Katareah 139 Debiganj Koshi River Chakarha Kursela 145 Jogbani Bakhri 155 Bathnaha Forbesganj Bihariganj Raghubans Nagar Dholbazar Barhara Kothi Gogipothia Sukhshena Simraha Aurahi Haldia Bihar Sukhasan Kothi Araria Araria Court Banmankhi Kushiargaon Sarsi Satar Alinagar Tola Jalalgarh Krityanandanagar Gharbanali Purnia Court Kasba Karhagola Road 162 Purnia NH 31 Rautara Semapur 173 Dalan Katihar 185 Manshi Kumaripur to Katihar–Siliguri line Manihari Teznarayanpur to Kumedpur km = halt

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The entire track lies on the northern side of the Ganges and traverses the Kosi basin. In Bihar, the Kosi is widely referred to as the "Sorrow of Bihar" as it has caused widespread human suffering over the centuries through flooding and frequent changes in course. Over the last 250 years, the Kosi has shifted its course over 120 kilometres (75 mi) from east to west. In August 2008, it picked up an old channel it had abandoned over a century ago near the Nepal–India border, and caused enormous damage in a wide area covering several districts. The breach in the Kosi embankment which caused the devastating flood in 2008, was repaired in 2009 and the river has since been flowing along its original course.^[8] The floods continue and threaten even the Barauni–Katihar tracks. The entire region portrays "a bleak picture of broken houses, flattened fields and ravaged lives, signs of all the havoc the previous floods and land erosion wreaked here earlier."^[9]

Gauge conversion work (from metre gauge to broad gauge) in the Barauni–Katihar section was taken up in 1978–79 and completed in 1982. In year 2001 Khagaria-Saharsa route was converted into broad gauge. Katihar–Jogbani route was converted into broad gauge in year 2009. The second main route of this section, Saharsa–Purnia route was converted into broad gauge in 2016. Gauge conversion of Saharsa–Forbesganj and Banmankhi–Bihariganj is on progress.^[10]

Electrification of the 809 kilometres (503 mi) long Barauni–Katihar–Guwahati section was sanctioned in 2008.^[11] As of 2011, work on electrification of Barabanki–Gorakhpur–Barauni–New Jalpaiguri route was in progress. Adequate funds have been provided in the budget for 2011–12 to take up work in the New Jalapiguri–New Bongaigaon–Guwahati section.^[12] The section is fully electrified. Most of the Delhi and Amritsar-bound trains run on electric locomotives. Amrapali Express was the first train to run on electric locomotive, then after Rajdhani Express, North-east Express, Purvottar Sampark Kranti Express, Seemanchal Express, Tripura Sundari Express have electric engines.