From Beijing capital to train station and going to Xian

It may need at least 30min to checkout from the airport. For the transfer to the Beijing west station, it would be easier if you take the shuttle bus. By subway, you need to change different lines during the way like airport express-line 2-line 4- line 9. For the shuttle bus, you need to leave at least 2 hours. And if you take the waiting time and time for the ticket collection and boarding process for the rail trip, it would be safer if you choose one around 2 or 2:30pm. It would be safer if you book it on advance since the seat did sold out sometimes on the day of travel.