Free Tourism Bus to Terracotta Warriors

Dear Sir / Madam,

I read an article that Government provides Free Tourism Bus to Terracota Army from Xi'an North Station for passangers by showing train ticket & entrance ticket , maximum 3 days after arriving in the city.

Train ticket - absolutely. But, how we can provide entrance ticket of Terracota Army if we just arrived and intend to visit Terracota Army?
Is there ticket booth for Terracota Army in North Station?

Please kindly advise.

Thankyou & Kind Regards,
Dwira