Besides Tourist Bus 3, are there other direct buses from Xian Railway Station to Qianling Mausoleum?

I am sorry there is no other direct transport. But you can take a bus to Qianxian County from West Bus Station. The buses are available from 7:00 to 19:00, and depart densely once they are fully seated. The fare is CNY 25.5. The trip takes about 1.5 hours. After arriving, take a bus to the mausoleum. You can follow the same route for the return trip. Don't worry! :)