I am reaching New Delhi from Varanasi in the morning and have to catch train from New Delhi railway station on the same day. How long would it take from domestic airport to New Delhi railway station? What is the best mode of transport, bus or Auto-rickshaw? I know there is a pre-paid taxi stand at the domestic airport, but it's too expensive, so is there any pre-paid auto rickshaw stand too? I have seen pre-paid auto-rickshaw stand at Agra railway station but I haven't seen one at any airport so far. Any info on the topic would be appreciated.