I feel that for long dist trains railways need to have a system wherein a fresh set of linen is loaded for its return journey. As of now it is seen that the for all trains it is loaded from the stations where PM is done. Many times due to lack of space some of them is kept in between coaches near the vestibule. And lot of times shortages are felt especially if trains have lots of stops and lots of intermediate passengers.
I have seen in trains like Kerala exp, Mangala exp, Dhn-alleppey, LTT-CBE and there might be many more examples.