RER NG

The RER NG (French: RER Nouvelle Génération, lit. 'RER New Generation'), 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 (RER), a hybrid suburban commuter and rapid transit system serving Paris and its Île-de-France suburbs. The trainsets entered service in November 2023 on line E, and in December 2024 on line D. The trainsets are manufactured by a consortium of French company Alstom and Canadian company Bombardier Transportation. The RER NG is part of Alstom's X'Trapolis Duplex platform and is a development of previous double-deck trainsets built by the consortium, including the Z 2N, MI 2N, and MI 09 series. Final assembly takes place at Alstom's factory in Valenciennes and the former Bombardier plant in Crespin, while the car bodies are manufactured at Alstom's plant in Česká Lípa, Czech Republic.