Hi, I plan to Travel to Beijing from Pudong International airport.

Dear Maria, the closest one is the Central Rail Station, but it has very limited trains. Only three high speed trains are available there and they all leave in the evening. Considering all, I suggest you go to Hongqiao Rail Station to easily catch a high speed train. To reach there, you can take shuttle bus line 1 (around an hour) or subway line 2 (90min).

It is advised to book the tickets in advance for it is a hot rail route. You may have the service from Travel China Guide by the way.