south west trains --- waterloo 到 Windsor & Eton Riverside Off-Peak 往返 10镑,单程56-57分钟,
first great western --- paddington 到 Windsor & Eton Central Off-Peak 往返 9镑,单程27-34分钟,Slough 转车
south west trains 官方网站 写的,adult省2.9镑
http://www.southwesttrains.co.uk/windsor-castle.aspx