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" The Duchess of Cambridge joined the Queen and Duke of Edinburgh at Baker Street Tube station today (March 20) to celebrate the 150th anniversary of the transport network. The pregnant wife of Prince William was given a &amp;#039;Baby on board&amp;#039; badge as a present by London Underground chief operating officer Howard Collins.   &amp;quot;I&amp;#039;ll make sure I wear it at home,&amp;quot; she joked as she stood on the platform. The tongue-in-cheek badges are available from Transport for London (TfL) and aim to end the awkwardness over pregnant women asking for a seat or being offered one. The trio were escorted through a brand new S7 train before the Queen unveiled a plaque, naming the train Queen Elizabeth II in her honour.   The royal party also viewed a restored 1892 underground coach, meeting staff and apprentices involved in the restoration project. Kate confessed during the tour that she misses travelling on the Tube. Collins told the Daily Mail: &amp;quot;She told me, &amp;#039;I used to use the Tube on a regular basis&amp;#039;. She doesn&amp;#039;t travel on the Tube now because of her new role, unfortunately.  &amp;quot;She said she rather missed [it] and asked lots of questions about the new trains, particularly the air conditioning which she said would make it much more pleasant to travel in the summer. &amp;quot;She seemed delighted with her &amp;#039;Baby on board&amp;#039; badge and said, &amp;#039;Oh yes I&amp;#039;ve seen this before - how do they work?&amp;#039; &amp;quot;We have been issuing them for the last ten years and I explained how fantastic they were and how they really do make a difference - saves men the embarrassment of having to guess if a woman is pregnant.&amp;quot; The engagement marked the Queen&amp;#039;s first public event in over a week. She recently received treatment for gastroenteritis. Photo gallery - Kate Middleton in pictures: "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/showbiz/royal-wedding-prince-william-and-kate-middleton/news/a467151/duchess-of-cambridge-joins-the-queen-on-tube-tour-pictures/>