Some mourners chanted “hip hip hooray” and “God save the king” as Charles passed.
A woman hands Charles a Paddington bear toy; The fictional bear has been associated with the Queen since appearing in a painting with the character during the Queen’s Platinum Jubilee celebrations.
People have been queuing for hours to see Queen Elizabeth II’s coffin since she was laid to rest in Westminster Hall on Wednesday.
The route approached full capacity on Saturday, the government said. At lunchtime on Saturday, the government’s queue monitor said the current waiting time was 14 hours.
Earlier on Saturday, Charles III visited Metropolitan Police headquarters in the London borough of Lambeth to thank police and emergency services officers who have been involved in planning and executing events since the late Queen’s death.
The Queen’s funeral on Monday will be the “largest single policing event” London’s Metropolitan Police has ever undertaken, Deputy Assistant Commissioner Stuart Cundy said during a media briefing on Friday.
The Queen’s grandchildren — including Princes William and Harry — are expected to hold a vigil at her coffin on Saturday.
On Sunday, ahead of the late Queen’s state funeral, King Charles will host “heads of state and official foreign guests” at Buckingham Palace.
The Duke and Duchess of Sussex, Prince Harry and Meghan, received an invitation to the reception by mistake, a source with knowledge of what happened told CNN.
As an official state event, the palace said only working members of the royal family would accompany the king. CNN told CNN they “think” there was an administrative error. As some media reported, the couple was “not invited” from the reception.
A spokesman for Sussex declined to comment.
“Total coffee maven. Extreme web geek. Award-winning explorer. Travel aficionado.”