Baggage allowance questions on domestic planes

I am travelling on an international ticket but will then be flying on a domestic flight Shanghai - Guangzhou. I am allowed more free baggage allowance on the international ticket. What weight/size of suitcases will I be allowed on the domestic flight Shanghai - Guangzhou? Can I keep the international baggage allowance?

Secondly, I am also travelling by train to other cities. What is the baggage allowance allowed on trains - one suitcase and one hand luggage per person?

Thanks.