The Sydney Trains A & B sets, also referred to as the Waratah trains, are classes of electric multiple units that currently operate on the Sydney Trains network. Based on the M sets, the Waratahs were manufactured by a joint consortium between CRRC Changchun and Downer Rail, with initial construction taking place overseas in Changchun before final assembly at Downer Rail's Cardiff Locomotive Workshops. The sets were named after the Waratah flower, which is the state's floral emblem.