[6] The line also acts as an important link for freight commodities coming in and out of the Kolkata Port connecting it with the rest of the country.

[7] With increasing public demand, some long-distance passenger trains were started in this section directly from Sealdah to connect to the Howrah–Kharagpur line, like the Sealdah–Puri Duronto Express.

In 1932, the Calcutta Chord Link Line was built over the Willingdon Bridge (now known as Vivekananda Setu) joining Dum Dum with Dankuni and opened for freight traffic, thus forming a direct link from Calcutta (now known as Sealdah railway station) to Dankuni on the Howrah-Bardhaman Chord, thus earning the line its name.

[7] Two major reasons identified for the congestion were its railway yard outstripping its capacity and passing of freight trains of the South Eastern Railway from Kharagpur towards Chitpur and Kolkata docks taking the circuitous route via Tikiapara, Liluah, Belanagar and then finally taking the Calcutta Chord link line to Calcutta.

[7] The work of building the line however progressed slowly due to land acquisition problems and was finally completed in December 1968.

However, with increasing public demand, some long-distance passenger trains were started in this section directly from Sealdah like the Sealdah–Puri Duronto Express in 2012.