need better transport option from xian airport to railway station

Well, according to your arrival time, you can take airport shuttle bus line 3 to get to the railway station directly. The operating hours are from 08:00 to the midnight.

If you miss the one to railway station, you can take airport shuttle bus line 1 to get to Xishaomen Airport Business Hotel first. This line operates until the last flight. Then take a taxi to get to railway station directly. The cab fare is about CNY 30 in the night.