I am going to take the following night-trains:
On Aug. 23, Train D308 -Hard Seat (Shanghai to Beijing)
On Aug. 27, Train D305 - Second Class Seat (Beijing to Shanghai)(booked from travelchinaguide.com)

My question is, where can I put my luggage? I have not decided yet on how much should I take with me or which luggage bag to use, but I will be staying in China for 1 week. Do trains with budget-seats (hard seat/second class seat) have spaces for luggage? Do I have to check-in my things, just like when riding a plane? If yes, is there an additional charge for that? Thanks a lot!