the first of 15 new SD-160 LRVs into service to accommodate the South LRT Extension Phase I and increased capacity. Throughout 2003, another 17 SD-160 LRVs were introduced into the fleet to accommodate the northwest extension to Dalhousie as well as the South LRT Extension Phase II. However, demand for light rail has exploded in recent years. In the decade prior to 2006, the city's population grew by 25% to over 1 million people, while ridership on the CTrain grew at twice that rate, by 50% in only 10 years. This resulted in severe overcrowding on the trains and demands for better service. In December, 2004, city council approved an order for 33 additional SD-160 vehicles from Siemens to not only address overcrowding, but to accommodate the northeast extension to McKnight–Westwinds and the northwest extension to Crowfoot. These new SD–160s started to enter service in November, 2006. In December 2006, CT extended the order by seven cars to a total of 40 cars, which had all been delivered by the spring of 2008. This brought the total of first-generation SD–160s to 72 cars numbered 2201 – 2272. These cars were all delivered without air conditioning, and retrofitted with air conditioning between 2009 and 2011. In November 2007 city council approved purchasing another 38 SD-160 Series 8 LRVs to be used in conjunction with the West LRT extension (2012) and further expansions to the northeast (Saddletowne 2012) and northwest legs (Tuscany 2014). These are new-generation train cars with many upgraded features over the original SD-160s including factory equipped air conditioning and various cosmetic and technical changes. These units started to enter service in December 2010 and are numbered 2301–2338. As of May 2012, all had entered revenue service. In September 2013, Calgary Transit ordered 63 S200 LRVs to provide enough cars to run four-car trains, and to retire some of its Siemens-Duewag U2s, which are nearing the end of their useful lifespans. Some of the 80 U2 cars were 34 years old, and all of them had traveled at least . The first of the new cars arrived in January, 2016 and delivery was expected take two years. The front of the new cars is customized to resemble a hockey goalie's mask, and they include such new features as heated floors for winter and air conditioning for summer. They also now have high-resolution video cameras covering the entire interior and exterior