A question to South TN Residents frequently commuting to & From Chennai

I have noticed that the rakes used for Nellai Exp just sit empty throughout the day (both in Chennai and Tirunelveli). Given the train takes about 12 hrs overnight, konjam stopping remove panna extra MS to TEN oru Intercity service operate pannalam. Idhukku pudhu train kooda theva illa, normal train vechale 10hrs oru return journey panna mudiyum. Your opinion on doing this? No idea why SR don't already do this. Ena morning time la Guruvayur thavira south poga vera train e kidayadhu.