The design of the trains was finalised in September 2004, and manufacture of two pre-production trains began in January 2005. The first train was scheduled to be completed by mid-2006. Metronet announced on 3 February 2006 that the first of the pre-production cars had been completed to allow it to be tested without being moved. From 21 July until 4 August 2006, an example of the train was on show at Euston Square Gardens, near Euston Square tube station, for a Customer Acceptance Test followed by public display. From September 2006, the first of the two trains underwent testing at Bombardier's manufacturing and test site at their Litchurch Lane Works in Derby. It was due to be delivered to London Underground by the end of 2006 for testing on the Victoria line during engineering hours (times after the line stops carrying passengers and repair and testing work is carried out), but this did not occur until May 2007. It will also be used for driver and maintenance training and familiarisation. The first of the trains was expected to begin passenger service for the Victoria line for evaluation purposes in July 2008, with the remainder of the fleet being delivered and entering passenger service in 2009. However, by October 2007 the date for the first train entering service had been moved to January 2009. The first train entered service on 21 July 2009, leaving Northumberland Park depot at 23:00 and forming train 277 leaving Seven Sisters at 23:55 to Brixton.