NZM to ANVT to NZM
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1) DTC Buses: Excellent connectivity. Exit from Sarai Kale Khan side (Pf#07 side) of NZM. Walk to the main road. Many buses bound to ANVT can be taken like 534A, 534, 543, etc. 543 is the fastest. Hardy takes 25 mins. Rs15 (non AC), Rs 25 (AC)
2) Auto: Legal fare: ~Rs 120 (Night Rs. 150). 12kms. 15-25-40...
more... mins depending on traffic. But STRICTLY exit through Sarai Kale Khan (Pf#07 side) of NZM, exiting on the wrong side will make it longer by 3kms!
3) Delhi Metro:
NZM Nearest Metro (in this case): Indraprastha. Exit from Sarai Kale khan (PF#07) side. Take an auto/shared auto/bus till Indraprastha Metro station
ANVT Nearest Metro: Anand Vihar. Directly connected to station. After exiting from station take the staircase on the right that leads to the station.
Blue line directly connects these two. No changeovers involved.
4) EMU: Not recommended. If you really want to take this option, take an EMU towards NDLS till TKJ, then take an EMU towards GZB till ANVR.
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(Image courtesy: Google maps)