Dear sir,
"For NFR trains coming from AZ side, it is possible to avoid HWH from LLH side using the loop line..." ---this is not possible. Mainline trains, coming from Bandel side can never use the Liluah-Tikiapara freight bypass. There is no such turnout available. Only Chordline trains can use the bypass. And moreover the line has speed of 10kmph, passes through some marshy lake side area. No commercial train has ever been through there...not even diverted trains.
Refer...
more... to image (Liluah stn HWH end), Right to Left
1st line is Up bypass
2nd line is Dn bypass
3rd line is Up chord
4th line is Dn chord
5th line is Up main
6th line is Main reverse
7th line is Dn main (not visible)