温莎附近两个车站， Eton & Windsor Riverside Station以及Windsor & Eton Central Station。查询south western railway的官网可以看到，两个车站都没有行李寄存。
https://www.southwesternrailway.com/travelling-with-us/at-the-station/windsor-and-eton-central


另外，关于温莎城堡（及周边）的行李寄存，官网是这么说的：

Is there anywhere to leave luggage in Windsor?
If you are visiting Windsor Castle, your luggage can be taken in with you but it will be scanned and therefore can only be accepted if it fits through Windsor Castle’s airport-style security scanners. Whilst you are in the Castle you can leave your luggage in the cloakroom free of charge but it must be collected before you leave. Luggage Storage Windsor (tel: 01753 581158) is fairly centrally located on Goswell Hill (what3words ///pushed.candle.finest) next to Patch on the Plaza and is open from 0900 to 2000 (please phone in advance to confirm). Storage charge is £5 per bag and bags cannot be held overnight. Mail Boxes Etc. Windsor on St Leonards Road also offers a luggage-storage facility for a daily charge; the shop is approximately 10-15 minutes’ walk from Windsor Castle.