Dankuni Junction is a Junction station because there are some routes which are join or bifurcate from other side. In Dankuni , Sealdah line and Howrah line Merged and there is also a bypass line which line joins South Eastern Railway...

That line is basically use for freight but now that route is using for passenger trains which are avoiding Loco changing at Howrah , so this line is One of lines which Bypassing Howrah and reach the train from Eastern to South Easten Zone....

in this video you will surely understand that route

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