Mansi–Saharsa line is a single 5 ft 6 in (1,676 mm) broad gauge track from Mansi Junction to Saharsa Junction of Bihar state. The line connects Saharsa, headquater of Kosi Division, to Mansi, a railway junction that provides access to Barauni–Guwahati line. The whole line falls under Samastipur Division of East Central Railway.

The first meter gauge track on the Mansi–Saharsa line was laid on 1 March 1907 between Bhaptiahi, Saharsa, and Simri Bakhtiyarpur, and later extended up to Mansi on 15 December 1907.^[1][2] The gauge conversion of this section to broad gauge was completed in 2005.^[3]

The Mansi–Saharsa railway line has witnessed two major tragedies. The Kosi train disaster on 6 June 1981 occurred when a passenger train derailed and plunged into the Bagmati River near Balahi, claiming an estimated 500 to 800 lives.^[4] On 19 August 2013, the Saharsa–Patna Rajya Rani Express ran over pilgrims at Dhamara Ghat station, killing over 28 people and triggering violent protests. Both incidents highlighted the safety challenges and infrastructure vulnerabilities of this flood-prone region.^[5]

• Bandra Terminus–Saharsa Humsafar Express
• Vaishali Express
• Saharsa–Amritsar Garib Rath Express
• Saharsa–Patna Rajya Rani Express
• Poorbiya Express
• Janhit Express
• Hate Bazare Express
• Saharsa–Amritsar Jan Sadharan Express (via Chandigarh)
• Purnia Court–Amritsar Jan Sewa Express
• Saharsa–Barauni Express
• Janaki Intercity Express
• Saharsa–Anand Vihar Terminal Jan Sadharan Express
• Saharsa–Amritsar Jan Sadharan Express (via Sirhind)
• Kosi Express
• Saharsa–Rajendra Nagar Terminal Intercity Express