RER NG

The RER NG, also known as the X'Trapolis Cityduplex and classified as Class Z 58000 and Class Z 58500, is a double-deck, dual-voltage electric multiple unit trainset operating on line D and line E of the Réseau Express Régional, a hybrid suburban commuter and rapid transit system serving Paris and its suburbs. The trainsets entered service in November 2023 on line E and in December 2024 on line D. They are manufactured by a consortium of Alstom and Bombardier Transportation and are part of Alstom's X'Trapolis Duplex platform, a development of the earlier Z 2N, MI 2N and MI 09 series, with final assembly at Alstom's factory in Valenciennes and the former Bombardier plant in Crespin and car bodies from Alstom's plant in Česká Lípa. The 3.75 billion euro contract was awarded to Alstom and Bombardier on 6 January 2017 for 255 trainsets, increased to 371 in October 2018, and in April 2023 Alstom exercised an option for 60 more. The first six-car Z 58000 trainsets entered regular passenger service on line E on 13 November 2023, followed by seven-car Z 58500 sets on line D on 13 December 2024.