Queen Elizabeth II
Queen Elizabeth II has allowed Meghan Markle to ride the official train with her during next week's engagement. Pictured: Queen Elizabeth II hosts a Garden Party at Buckingham Palace on May 31, 2018 in London, England. Getty Images/Yui Mok - WPA Pool

Queen Elizabeth II has reportedly invited Meghan Markle to travel overnight on board the monarch's private train as part of their official engagements next week.

According to Express only the most senior members of the royal family are allowed to ride the nine-carriage train. This means that the Queen, Prince Philip, Prince Charles, and Camilla Parker-Bowles are the only ones to have enjoyed the privilege.

Indeed, Prince William, Prince Harry, Kate Middleton, and her three children have not traveled on the train with their other family members.

But since the Queen and Markle will be the only two Royals to head to Cheshire next week, the monarch has allowed her granddaughter-in-law to join her on the ride suggesting a close bond has already developed between the two women.

While in Cheshire, the Queen and Markle will unveil a new bridge in Widnes, and they will also open the Storyhouse Theater before the royal pair sits down for lunch at Chester’s Town Hall, according to People.

The publication also noted that the Duchess of Sussex and the Queen will have multiple stops within the day as part of their “away day” as members of the royal family.

On the following Saturday, Markle will also join her husband, Prince Harry, on her first ever Trooping the Colour, which marks the Queen's 92nd birthday. The former “Suits” star will appear on the balcony of the Buckingham Palace along with other members of the royal family, fo the first time.

Specualtion is already mounting as to what Markle will wear to the June 9 event. But there are some royal fashion rules that she needs to adhere to. For instance, no member of the royal family is allowed to wear black. She cannot also wear anything too short. If her legs will be shown, she is expected to wear pantyhose.

Trousers are not also allowed so royal fans can expect to see the Duchess of Sussex in a dress and a fascinator. Markle could wear an attire in bright hues just like what Middleton did last year. The Duchess of Cambridge wore a hot pink tailored dress to the Trooping the Colour.