All the south north trains are introduced 15 yrs back and frequency need to be increased. For that IR need to create 2 new slots from Gudur upto Nizamuddin. At present AP and TN Sk ahare same slot which should be separated and make AP SK and TN SK into daily. A triweekly from Tirupati via NLR and weekly via Nandyal APSK should be introduced to make daily.