Seniors, help me understand what below mean and how is this possible ? Its from NR website.
Merger Of Rake Link Of 12279/80 Nizamuddin(H. Nizamuddin)- Jhansi Taj Express And 12497/12498 New Delhi- Amritsar Shan-E-Punjab Express Has Been Done W.E.F 09.09.17. Alternate Primary Maintenance Is Being Given After 2 Complete Trips. one Daily Primary Maintenance Slot At Nizamuddin And 3 Primary Maintenance Slot Per Week At New Delhi, Have Been Saved.