High Speed Bullet Train Reservation for a two day round trip from Beijing to Nanjing as an American

Hi there, if you have a Chinese bank card or speak Chinese well, you can reserve the tickets from the official website of China Railway Corporation or via phone. If not, the most convenient way is to reserve from a booking agency. As I know, this website offers train ticket booking service and to be frankly, they are the leader in that area. If interested, this is their contact info: bookingtravelchinaguide.com
Happy trip~