The Queen has made a surprise visit to Paddington Station to see the completed Elizabeth line.
Using a walking stick, the Queen smiled as she met staff who have been key to the project.
Transport for London (TfL) has announced the delayed Crossrail project will open to the public on 24 May.
Ahead of the opening, the 96-year-old joined her youngest son the Earl of Wessex for the official visit.The longest reigning head of state is just over two weeks away from her Platinum Jubilee celebratory weekend to celebrate 70 years as monarch.
It was a rare public engagement for the 96-year-old monarch, who missed the state opening of parliament last week.
The Queen and Earl of Wessex unveiled a plaque to mark the completion of London's Crossrail project.
Queen Elizabeth II and Prince Edward were welcomed by Prime Minister Boris Johnson, Mayor of London Sadiq Khan and TfL commissioner Andy Byford.
They met staff who have been key to the project, formerly known as Crossrail, and those who will run the railway, including train drivers, station staff and apprentices.
Felix is the founder of Society of Speed, an automotive journal covering the unique lifestyle of supercar owners. Alongside automotive journalism, Felix recently graduated from university with a finance degree and enjoys helping students and other young founders grow their projects.