The Bogibeel Rail-Cum-Road Bridge Project, a major undertaking connecting the states of Assam and Arunachal Pradesh in North eastern India, opened on December 25, 2018. SGS recently completed the technical inspection of the girder welding works for the superstructure project.

The Bogibeel bridge project was developed by the Indian government in the early 1990s, to address the connectivity challenges in northeast India and the logistics on the Sino-Indian border. At the time, cargo originating from Dibrugarh in the northeastern corner of Assam, required a 600 km detour to cross the river Brahmaputra.

By developing India’s longest rail bridge, a super-structure measuring 4.94 km in length, the project aimed to connect the north and south banks of the Brahmaputra river in the eastern region of Assam and Arunachal Pradesh. The connection begins at Chalkhowa station and Moranhat station at the south bank, joining Sisibargaon station and Siripani station in Rangiya-Murkongselek at the north bank.

The bridge is expected to deliver a serviceable period of at least 120 years. As well as connecting the Dibrugarh and Dhemaji districts of Assam, it will reduce travel distances for over five million people living in Assam and Arunachal Pradesh. It will also provide better rail-road connectivity to 16 districts of Arunachal Pradesh and the lesser developed areas in both the states.

As the country’s longest rail-bridge and second longest rail-cum-road bridge in Asia, the bridge has a composite welded steel truss. In its lower section, the bridge accommodates double-line, broad-gauge railway tracks and a two-lane roadway with a 10m carriageway.

Used in application for the first time by Indian Railways, the bridge features composite welded girders – a new technology, first conceived for the Öresund Bridge between Sweden and Denmark.

SGS Undertakes Third-Party Inspection of Work

SGS was commissioned by Northeast Frontier Railway to provide third-party technical inspection for the project in April 2014. For over four and a half years, a team of 21 SGS experts was deployed on site to conduct a wide range of technical inspections, such as witnessing of welding testing including non-destructive testing (NDT).

SGS provided the following:

  • Visual inspection of welds
  • Witness of Ultrasonic Testing of welds
  • Review of Radiographic Films
  • Witness of Magnetic Particle Testing of welds
  • Witness of Dry Penetrant Test of welds

Project Results

Using highly trained, certified NDT inspectors and well-designed procedures, SGS ensured the smooth completion of this prestigious project by:

  • Monitoring the integrity of the structure and components, using intrusive or non-intrusive methods
  • Detecting defects and irregularities in time to mitigate the occurrence of any severe damage or non-compliance
  • Saving time and money through fast and effective witnessing of testing of assets and equipment at every stage of their lifespan
  • Ensuring safe and reliable operation throughout the project lifecycle


SGS received a Certificate of Appreciation issued by the Northeast Frontier Railways in recognition of the quality and timeliness of the services provided for this project.

Cresenciano G. Maramot, SGS India Managing Director, said: “We are proud to be part of this national project on infrastructure development in North Eastern India, which positively impacts the lives of millions of people by enhancing connectivity between the states of Assam and Arunachal Pradesh. Our independent technical inspection services helped to build this heavy-duty structure, which is designed to bear heavy weights and heavy moving loads, and ensure compliance with the relevant quality standards to be best-in-class. As the world’s leading provider of manufacturing inspections and technical inspections, we offer unrivalled experience, expertise, resources and a unique global network.”

Non-destructive testing services from SGS ensures the safe and efficient operation of your equipment and assets by detecting defects before they result in severe damage, and assures compliance with international standards.

For further information, please contact:

Mr. N. Paulson
Business Director
t: +91 98 6701 9051

About Northeast Frontier Railway

The Northeast Frontier Railway is one of the 18 railway zones in India. Headquartered in Maligaon, Guwahati in the state of Assam, it is responsible for rail operations in the entire Northeast and parts of West Bengal and Bihar.

About SGS

SGS is the world’s leading inspection, verification, testing and certification company. SGS is recognized as the global benchmark for quality and integrity. With more than 97,000 employees, SGS operates a network of over 2,600 offices and laboratories around the world.