As of now, yes it is a freight dedicated line (except a few express service). A double line will help in running more freights without waiting for X-ing (as it now happens in single line section). ER is constructing 2 more loop lines at Bhattanagar for more freight reception, examination, dispatch.
ЁЯФ╣And if u ask for passenger traffic, an inspection trial was conducted jointly by SER/ER using the path.... SRC-TKPR-BLY-RCD-DDJ-Circular Rly MJT-DDJ-RCD-BTNG-SRC... To check EMU operation feasibility through the above route. As of now, there appears no interest of both zones regarding this matter. So it may be concluded that the doubling is for better freight operation.