Rather than Arayanak, rather the tri-weekly RNC-HWH Intercity Express can & should be diverted via IPTN & CHAS in the near future.
Makes no sense to keep on entering ECR if it is not going via Dhanbad and Chandrapura has other options for Kolkata.
Instead the IPTN line would get a new service.
Arayanak should not be extended anywhere beyond BKSC!