NZM to NDLS to NZM
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1) DTC Buses: Exit from Pf#01 side of NZM. Bus No. 181 is available right outside the station. Quite frequent. Rs15 (non AC), Rs 25 (AC)
2) EMU: Frequently available (By frequently I mean 1 service per hour). Cheapest and fastest. Takes 15-25 mins.
3)...
more... Auto: Legal fare: ~Rs 120 (Night Rs. 150). 12kms. 25-30-45 mins depending on traffic. Exit through PF#01 side of NZM.
4) Delhi Metro: Poorly connected points through DMRC. Take an auto till Jangpura Metro station, then Violet line till Central Secretariate then Yellow line to New Delhi. Not recommended.
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(Image courtesy: Google maps)