I am traveling with my dad to Changsha and we need to get from Changsha to Hong Kong and we don't really have any time restraints and we haven't traveled in China very much so we thought that it would be fun to take a train from Changsha to Hong Kong instead of flying. We think it would be a nice way to see a part of the country and it would be fun to ride on a high speed train which we haven't done before.

It looks like our best option is to take the G train to Shenzhen and then take the subway to Hong Kong.

Has anyone done something similar before and have any recommendations? Neither of us speak any Mandarin, will that be an issue?

Is business class worth it for a couple hour journey?

Thanks for any help you can provide