The new C-Series railcars, and Australian railcars will be delivered over a 10-year period as part of a contract that Alstom has with the Public Transport Authority of Western Australia (PTA). Under the contract, Alstom is responsible for the design, supply, manufacturing, testing and commissioning of 41 x 6-car electric (EMU) and 2 x 3-car diesel (DMU) trains and 20 years maintenance of the EMU trains and maintenance support services for the DMU trains. These new railcars will run along the Joondalup and Mandurah lines, two of the busiest services on the Perth network.