Beijing Train station - Left luggage facility.

Hi friends,

I will land in capital Airport at 01:00 early morning on a sunday. And have to catch a train from BJ Railway station (main station) at 23:00 same day. So i am planning to go to Train station from airport and deposit my luggage at the counters there and then start my great wall and city sightseeing. Does anyone know the opening and closing times of the left luggage counters ? Will it still be open if i return at night around 22:00 ?