Commuters travel in a carriage on an Underground train in London, England. - 

Extreme hairdo owner and London Mayor Boris Johnson announced big changes this week for London's subway system, the Underground. Besides train service running 24 hours a day, Tube riders will soon be able to enjoy WiFi service. Also coming: a way to pick up things you bought online in old ticketing offices. BBC tech correspondent Mark Gregory tells Marketplace Tech about the new changes.