Grand Chord is part of the Howrah–Gaya–Delhi line and Howrah–Prayagraj–Mumbai line. It acts as a link between Sitarampur, (Asansol), and Pt. Deen Dayal Upadhyay Junction,, previously known as Mughalsarai Junction, and covers a stretch of 450.7 km (280.1 mi). The Coal India Corridor line that branches off from Dhanbad Junction and rejoins the Grand Chord at Son Nagar Junction is another major coal loading hub. It is a fully electrified, quadruple line section from Pt. Deen Dayal Upadhyay to Son Nagar and double line section from Son Nagar to Sitarampur. There are plans to triple the lines from Son Nagar to Dhanbad to accommodate the increasing traffic.. The entire line lies under the jurisdiction of three divisions, Mughalsarai railway division, Dhanbad railway division and Asansol railway division. The Grand chord section is the lifeline of the country, 2nd busiest railway section of India after Ghaziabad, Uttar Pradesh to Pt. Deen Dayal Upadhyay Junction, Uttar Pradesh Main Line section, on which coal, steel and other important goods are moved from Eastern section to Western and Northern sections of the country. In the down direction, the traffic consists of mostly food grains, fertilizers and empty wagons for coal loading in the Jharkhand and West Bengal coal fields. Pt. Deen Dayal Upadhyay Junction is a transit division and the main objective is to maintain mobility of high density traffic. The present capacity of the Grand Chord is being optimally utilized. Traversing through Chota Nagpur Plateau of Jharkhand as well as parts of the fertile Gangetic plains of Bihar, the Grand Chord covers a stretch of 450.7 km (280.1 mi). The Grand Chord is renowned for its remarkable controlling of passenger traffic, despite being burdened with freight traffic.

The Howrah–Prayagraj–Mumbai line, is a railway line connecting Kolkata and Mumbai via Prayagraj. The 2,160-kilometre long (1,340 mi) railway line was opened to traffic in 1870. This railway line was 2,146-kilometre long (1,333 mi) until 2004. In 2004 the construction of Indira Sagar Dam submerged the old alignment near Khandwa & a new alignment of 14-kilometre long (8.7 mi) was relaid.