From London Waterloo this is approximately a 53 minute journey, but takes you directly into Windsor and Eton Riverside Station -
A similar journey can be taken from London Paddington to Windsor (this being only 30 minutes by fast train) with one easy change at Slough. If you are journeying from the West, it’s best to travel via Slough too. On arrival at Slough just walk to platform one and get on the quarter hourly Windsor train that takes you into Windsor Central Station (located just beneath the Castle walls and less than a five minute walk to Windsor Regus). This route is serviced by First Great Western Rail, with roughly three journeys per hour.