Something interesting:
There is a fortnightly sf express between Madurai and Chennai which runs on thursday, sat from Madurai. Friday and Sunday from Chennai .The interesting thing is that on Monday there is a Madurai Nizamuddin Sampark Kranthi which starts on Monday from Madurai reaches NZM on Wednesday leaves NZM on thursday reaches Mdu on Sat runs on Sat from MDU to reach NZM on Mon leaves Tue and reaches MDU on Thu and then 2 links sent to Chennai.How can schedules made like this ?