Ek train ER ki hai aur dusri SER Ki. Yahi main fark hai.
My first point was cost. They don't want additional manpower cost during covid time. Abhi Aisa hi lagta. Baki sab logic gaya tel lene. Baad mein electric hone par ek hi loco ka zarurat hoga. Hsda bypass bana to important station miss ho jayega. I hope they use both end loco for all bgp bound trains forever, otherwise bypass.
Aur HS ko bgp mein 30 min rukna hi hai. So timing is not issue