Train from Gaungzhou to HongKong airport.

I am travelling from Guangzhou to Hong Kong airport. I have flight at 19.45 from Hong Kong airport for Mumbai -India . Is their any direct train from Gaungzhou to Hong Kong airport . What is the travel time. For 19.45 flight what time I should catch train from Guangzhou. I am travelling on Business Class. Alternatively if train is only upto Hong Kong, what is the travel time to airport from there.

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