First, you can look at the planned Metro network in Kolkata:
At this time Line 1 is fully completed and a relatively small part of Line 2 has been opened.
Also see this: https://en.wikipedia.org/wiki/Kolkata_Metro_Line_1
The proposed link from Baranagar to Line 4 is not under construction yet.
Here we can see the full list of stations on Line 1 in both directions. This includes the station codes as well as inter-station distances. Different sources may give slightly different distances.