Luggage allowance (1 person)

1)Can I bring 2 pieces of luggage ( less than 44 lbs each) and a backpack to catch a high-speed train from Hong Kong West Kowloon Station to Guangzhou Station with me (only myself, one person)?
2)Can I pay for the 2nd luggage if only 1 luggage is allowed for one person ?
3)Is there any free Wi-Fi available at Guangzhou Station ?
Thank you