it depends! if there are little travlers on the train, you may have your bike together with you. but if there are a lot of travlers, your bike may be transported as a checked luggage, and you need to pay money for it. Once i saw a passager took his bike apart and put the parts into a bag and brought the bag with himself on the train. you can try this way but make sure you know how to make up the seperated parts together! Enjoy your trip in China!