Substation at Y is indeed not ready. Earlier last year when FEDL was just complete, few trains mentioned above used to run w/ e-link. But since recently Chamundi, Rajya Rani was changed to e-loco and now SBC-MYS MEMU are running, transmission losses will only be higher. So there are 3 options w/ SWR as of now:
1. Keep running Chamundi + Rajya Rani w/ e links, and bear extra transmission losses
2. Pressurise KPTCL to complete work ASAP.
3....
more... Withdraw e-link for one of the trains.
So far for me, 3rd option seems more possible in future.