Hello, how many doors are opened for the passengers on and off?

How many doors are opened for the passengers to get on and off the train at Jiangxi province, Xinfeng County? If we buy the soft sleeper tickets, do we have to use the same door to get in the train with the people who buy the hard seat? I am worried that we won't be able to get into the train on time before the train departs from Xinfeng. We have four children, ages 5 to 13, and it might be a challenge if the train only opens one door, if it is very crowded, and passengers only have five minute to get off and on.