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Note: This is a sub-section of the East Indian Railway
The East Indian Railway Company was making regular efforts to reduce the distance of the Howrah to Delhi main line. After a survey in 1888-89 and two more subsequently, a route was determined from Dhanbad to Mughal Sarai via Koderma and Gaya. The major works in this section were the Upper Soane Bridge at Dehri, and tunnelling and ghat line construction between Gurpa and Gujhandi.
1907 The Grand Chord was opened. When the Grand Chord was under construction, the Son Nagar-Daltonganj branch line was opened in 1902
The Grand Chord one of the two parts of the main Delhi-Howrah route. It acts as a link between Sitarampur, (West Bengal) and Mughal Sarai, Uttar Pradesh, and covers a stretch of 450 km. It is a fully electrified, triple line section from Mughalsarai to Dehri-on-sone and double line section from Dehri-on-sone to Asansol. The Grand chord section is the lifeline of the country 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 Bihar and West Bengal coal fields. Mughalsarai is a transit division and the main objective is to maintain mobility of high density traffic