Double line extends till Tinaighat infact. Besides SVM to Majorda also double line in Goa. SWR will not allow a train untill there is a political pressure eg. VSG HYB/TPTY, VSG JSME, VSB BGM biweekly passenger (discontinued) or there is some benefit to Karnataka ie. VSG YPR frequency increase from biweekly to daily (serves alternative ICE to Siddhaganga SF).
This also obstructs LHBfying of HWH VSG which was proposed by SER I think (fellow Goan RF told me) but cancelled bcoz slip cancellation was rejected.