Just browse the pnr search for the trains of ap, gt, dakshin and ap-sk'nti trains, which are halt at rdm, mci, skzr. Enter these stn codes in pnr search indivisually. You will find wait list and which stns ( rdm, mci, skzr) people are travelling to long distance. Chandrapur is districr headquarter, but more trains halt at bpq. Skzr is in forest area and need as many as more trains, due to large gap between rdm and bpq. Khammam is bigger than rdm but less halts at khammam, since it is in between bza- wl with well connected road from bza and WL in addition to more passenger/ exp trains.