More than 2,500 troops - sailors, soldiers and Royal Air Force personnel from nearly all areas of the Armed Forces - will parade before the Queen and the Duke of Edinburgh through Windsor today. They will be joined by a tri-Service Guard of Honour for Her Majesty, and six military bands.
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The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.