travel from hongkong to beijing or shanghai

There is no bullet tide between HK and Beijing or Shanghai. You would need to have a connection at other city like Guangzhou or Shenzhen first if you want to cut the trip shorter. You can check the schedule on this website except the trip Shenzhen to HK. The trip between Shenzhen and HK is a MTR instead like s submit. You just buy the ticket after our arrival.