Spectators travelling to Windsor for the royal wedding will face "extremely busy" conditions, rail bosses have warned, with queuing systems set to be utilised for neighbouring stations.

More than 100,000 people are expected to visit the town on May 19 hoping to catch a glimpse of Prince Harry and Meghan Markle.

Queuing systems will be introduced at several stations in a bid to avoid platforms becoming overcrowded.

They could include London Waterloo - already the UK's busiest station - Slough, Staines and the two stations in Windsor itself.

If the number of visitors proves to be a safety issue, Thames Valley Police may order trains not to stop in Windsor and close off the wedding's processional route to latecomers.

Passengers are urged to keep baggage to a minimum as excess luggage could delay journeys amid security checks.

Mark Hopwood, managing director of operator Great Western Railway, said the wedding will be "one of the largest ever one-day events that has taken place on our network".

He went on: "Our aim is to ensure our customers have a great day out and enjoy what will be an international spectacle."

More frequent and longer trains will operate to and from Windsor.

Services between Windsor and Slough will run every 20 minutes, with trains increased from two carriages to four, which is the maximum that can operate on the branch line.

South Western Railway will double its direct Windsor services from London Waterloo to four per hour, and use 10-carriage trains.