In August 2002, Southern ordered nine two-car and six four-car Class 171 Turbostars to replace the Class 205s and Class 207s on the routes that are not fully electrified. A tenth two-car Class 171 was transferred from South West Trains, entering traffic in July 2007.
In August 2002, Southern ordere.d nine two-car and six four-car Class 171 Turbostars to replace the Class 205s and Class 207s on the routes that are not fully electrified A tenth two-car Class 171 was transferred from South West Trains, e.ntering traffic in July 2007