The Barauni–Samastipur section is a railway line connecting Barauni to Samastipur in the Indian state of Bihar. The 50.54 km (31 mi) line passes through the plains of North Bihar and the Gangetic Plain in Bihar.

Former Railway Minister Lalu Prasad Yadav announced for the electrification of the Barauni–Samastipur–Muzaffarpur–Hajipur line and Muzaffarpur–Gorakhpur line (via Hajipur, Raxaul and Sitamarhi) in the Rail Budget 2008. The electrification began in 2011 and was completed in 2014.^[2]

The electrification work was completed in December 2014 itself. But the first passenger train to run with an electric locomotive was Maurya Express w.e.f. 23 November 2015.

There are 9 stations between Barauni and Samastipur Junction.^[3]

The Barauni–Samastipur–Muzaffarpur–Hajipur line is not an A-Class line of Indian Railways. So maximum speed is restricted to 110 km/h.

The following sidings and workshops exist on the line:^[4]

• 100+ diesel locomotive yard capacity at Samastipur
• Freight terminal at Karpurigram railway station
• Workshop for wagon maintenance at Samastipur
• Barauni Thermal Power Station, Barauni
• Indian Oil Corporation, Barauni
• Major freight terminal at Garhara Yard

• Muzaffarpur–Gorakhpur line (via Hajipur, Raxaul and Sitamarhi)
• Barauni–Gorakhpur, Raxaul and Jainagar lines
• Muzaffarpur–Hajipur section
• Samastipur–Muzaffarpur section
• Muzaffarpur Junction
• Samastipur Junction
• East Central Railway zone