Her great-great-grandmother, Queen Victoria, was the first ever British royal to take a train journey.
Today, 175 years later, the Queen along with the Duke of Edinburgh recreated that very same trip on the Great Western line travelling from Slough in Berkshire to Paddington.
It's fair to say, things have changed a bit since 1842.
As Mel Bloor reports.
Mel spoke to Isambard Thomas and Mark Hopwood from Great Western Railway.
The Princess Royal reviewed the seven ships in P&O Cruises' fleet at Southampton to mark the company's 175th anniversary.
The Princess Royal reviewed the seven ships in P&O Cruises' fleet at Southampton in an anniversary marred by foul weather and traffic chaos.Read the full story ›
These were the scenes this morning as, through the mist, seven liners - Adonia, Arcadia, Oceana, Azura, Ventura, Aurora and Oriana - arrived in Southampton. Mike Pearse has this report:
It's been a day of celebrations - a record seven luxury cruise liners and 40,000 passengers and crew, all in honour of P&O's 175th anniversary.
But, with the crowds came what some described as "organised chaos" - traffic jams in and around the city of Southampton - and passengers waiting hours for taxis or coaches to reach their destinations. Kerry Swain reports.
Passengers have complained that the 175th anniversary of P&O ferries has turned into "absolute chaos" as they try to disembark at Southampton.
The seven cruise ships are proving popular...as thousands flock to Southampton to take part in the P&O celebrations there are queues of over a mile to get into Ageas bowl.