how to xi'an by train

Xi'an Station is at the north end of Jiefang Road (解放路; pinyin: jiěfànglù), just outside the northeast city wall. As you exit, there will probably be lots of people offering cheap hotel rooms; just ignore them if you already have a room booked. Even if you don't, you probably don't want to get one from them anyway. Also, don't fall for the people who offer to exchange a Xi'an map for your used train ticket - they reuse them for some shady purposes, e.g. re-selling them to people who just want to get into the station or try to sneak on a train.
In Xi'an, it is very easy to get to the railway station by city bus from anywhere in the city. There are several stops within 200 m of the station (look for train station East or North on a bus route (火车站东/北). Bus 603 will take you into the city for only 1RMB. Many hostels also offer free pick-up if you arrive between 6 and 9 AM.
Xi'an North Station serves the high-speed rail. It is connected by the metro system. Destinations include Luoyang, Zhengzhou, Wuhan, Shijiazhuang, Beijing, Shanghai, Nanjing, Changsha, Guangzhou and Shenzhen.