Delays in track laying and depot construction affected vehicle testing. By September 2009, construction was reported to be nine months behind schedule, and CAF was due to deliver the first trams from its factory in Spain. With key project dependency out of synchronisation, TIE held discussions with Transport for London about delivering the trams to Croydon to conduct operational tests on the Tramlink network. Tram vehicle testing commenced in March 2010 on the Siemens test track in Wildenrath, Germany. The tests included recreating the steep gradients of Leith Walk, and using weights to simulate the heavy passenger load expected during a Murrayfield match day.