Dear Andy, Thank you for your questions. From our experience, when you do the security check at the station, the staff will not weight your luggage, they only need to check if you bring any Prohibited items dangerous articles like fireworks, knives and fragile items. Therefore it’s no problem with carrying one 20 KG luggage with you when taking the train. If you have any problems when taking the train, please contact us, also you could ask help from the attendant or staff on the train. Best regards,