The Chord link line is also known as Calcutta Chord link which is the Branch line of the Kolkata Suburban Railway which comes under the jurisdiction of Eastern Railway's Sealdah Division & Howrah Division. Its termini are and on the Sealdah-Dankuni route where it meets Howrah–Bardhaman chord line with the length of 22km with 9 stations. Which is an important link for both Divisions of Eastern Railway zone and has an direct connectivity with South Eastern Railway. From Sealdah to it shares a line with the Eastern line's Sealdah section mainline. After Dum Dum Junction, It Splits into two lines and starts elevation and runs parallel with the Beleghoria Expressway by Passing through Baranagar after which it crosses the Hooghly through the Vivekananda Setu and onto and also Elevates over the Howrah–Bardhaman main line at Bally and Ends at. Additional Chord Connector has two wing which meets at Rajchandrapur before proceeding to Sealdah & other wing proceed to Dankuni. The Additional Chord link line which connects to the Santragachi–Amta branch line with the length of 13 Km to which it lies at the South Eastern main line to Kharagpur is totally a single line. which stretches parallel to the NH-6 popularly Bombay Road. In the middle of ACCL there is Bhattanagar RPF post where 4 track exist for Goods Train. Towards Andul, it crosses Kona bridge and meets with Howrah-Amta Line at Baltikuri Halt where no train stops at present. This line was opened in 1865 and converted to electrification in 1965, On that time the Freight Services was passed on this line which was profitable for railways and the EMU trains also runs on this line for connecting to Chord line to Howrah Jn for plying long-distance trains. But due to Passenger Demand was Increased for Long Distance trains Start from Sealdah to pass through to this line and connects to the rest of India. for that purpose A Duronto Train to Puri from Sealdah was Started on 12 February 2012 for direct connectivity to Puri from Sealdah.
Recently there is Doubling work of Dakuni - Andul line is going on to introduce more passenger train. If doubling work completes, a lot of trains would start from Sealdah or Chitpur Kolkata Terminal by which passengers of Kolkata would get convenience. It will alleviate pressure on Howrah. Besides Sealdah will get direct EMU train towards Kharagpur South Eastern mainline section.
