159001 leads two classmates (the last of which is still in Network SouthEast livery) past Worting Junction on 16 July 2001 with the 05:39 Yeovil Junction to Waterloo South West Trains service. Although numerically the first member of the class, 159001 was not the first to enter traffic, as 159004 had that honour. The Class 159s were originally built as Class 158s, and then upgraded for the West of England route, which included the addition of first class seating. Ironically for a class that was destined to work in the south of England, this work was carried out at Rosyth, in Scotland.