你好!

I'm taking the 2-hour G-type train from 郑州 to 西安, but the train station in 西安 is 西安北站 (which I believe is different from 西安站). Can you please tell me how to get to the Terracotta Army site from 西安北站? What options do I have? I plan on only doing a quick day-trip (arrive in 西安 at around 10-10:30am, leave 西安 at around 5-6pm and back in 郑州 by 7-8pm). 谢谢!!