When it comes to trains in London, there are no shortage of people who use them on a daily basis. As such the government is expanding the fleet with more tracks being put in place and updated, modernized trains.
Using this form of transportation to get around the country is so commonplace, that it would be a hinderance to not expand the options available to the public. With so many people coming into the country's capital every day, things can become crowded, so this alternative should help to ease the busyness ever so slightly. Everything is scheduled to be completed at some point in 2017, but it's not for certain as to whether or not construction will be finished in time.
Photo Credits: designboom, barberosgerby