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: Introduction 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 .