Dear Paul, according to the train schedule, you can take the train of Guangzhou/ Shaoxing K210/ K211 1524/1123 directly. As for the regulations of carry-on luggage on the train, you may refer to this "The China Ministry of Railways stipulates that the weight of hand luggage you carry onto the train is limited to a maximum of 20 kilograms (44 pounds); other baggage can be checked onto the train and the related formalities should be transacted at the railway station before your departure". You may check this https://www.travelchinaguide.com/essential/railway.htm for more details about the train in China.