What was later known as the Sahibganj Loop was the first line from Kolkata to Delhi and the first direct train started in 1866, but the shorter line via Asansol and Jhajha came up in 1871.
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An important railway junction, Adra railway station connects to Asansol on the Howrah-Delhi Main Line, Tatanagar on the Howrah-Nagpur-Mumbai line, Kharagpur on the Kolkata-Chennai and Kolkata-Mumbai lines, and Gomoh on the Kolkata-Delhi line.
The Bengal Nagpur Railway was formed in 1887 for the purpose of upgrading the Nagpur Chhattisgarh Railway and then extending it via Bilaspur to Asansol.