Yes adding a extra RORO service at the Khana link cabin to the UP slow line in the BWN-ASN section, would definitely bolster connectivity with Shantiniketan area with the Shipanchal area.
Another thing that has to be done ASAP is the alternate DC line being built quickly so that the train services between DHN & RNC can be seamless and increased in load. The existing line is on it's last leg and more and more services are being introduced on this line.
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New trains like JSME-VSG and the existng running trains on the DC line are running at a great risk, and the expected date of completion of the reallignment i.e 2027 might be a bit too late I am afraid. Who knows whether the existing DC line may survive for that long...