You mean there are no or less AC passengers in amritsar as compared to jalandhar? FYI, check the availability of Mumbai Jalandhar AC express. Train is vacant between Jalandhar and delhi and waiting starts for the journey between Delhi -Mumbai. After train reaches jalandhar, it halts only for 3 hours and starts its journey back to Mumbai. Had there been vacant yard in nizamuddin ,delhi or amritsar, it would not had a terminal to jalandhar.