The British Rail Class 319 dual-voltage electric multiple units (EMU) were built by BREL York in two batches in 1987–88 and 1990. The trains were introduced for new north-south cross-London services from Bedford to Brighton, and since privatisation these services have been operated by Thameslink and First Capital Connect, the former franchise having been merged with the Great Northern section of the former WAGN franchise to form the latter train operating company on 1 April 2006 as a result of re-franchising. Class 319 units have dual-power pick-up, from either 25 kV alternating current (AC) overhead lines for services north of London, or 750 V direct current (DC) third rail to the south. However, some units were used only on outer suburban services in South London. The Class 325 postal un