Original: Introduction of the 2009 Stock The design of the trains was finalised in September 2004, and manufacture of two pre-production trains began in January 2005, with the first train scheduled to be completed by mid-2006.
Simplified: 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.