RER NG

RER NG (French: RER Nouvelle Génération, English: RER New Generation) is a double-deck, dual-voltage electric multiple unit trainset that is currently under construction. Also known as the Class Z 58000 and Class Z 58500, the trainsets are expected to operate 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 were built by a consortium of French manufacturer Alstom and Canadian conglomerate Bombardier. The RER NG is considered to be a part of Alstom's X'Trapolis Duplex platform and is an evolution of several generations of double-deck trainsets built by the consortium, including the Z 2N, MI 2N, and MI 09 series.

History
As Île-de-France Mobilités and SNCF prepared to extend the RER E line west across Paris, the agencies issued a invitation to tender for new trainsets for the line and overall fleet replacement. Several manufacturers responded including a consortium of Alstom and Bombardier, CAF, and Siemens.

Ultimately, the €3.75 billion contract was awarded to Alstom and Bombardier on 6 January 2017. The consortium had previously built several generations of double-deck trainsets, including the Z 2N, MI 2N, and MI 09 series. Similar to those earlier contracts, Alstom would build the two end cars, which contain the cabs, while Bombardier manufactured the intermediate cars. The contract will supply 255 trainsets, 130 for the RER E and 125 for fleet replacement, which are planned to be assigned to the RER D, replacing older trainsets.

In October 2018, Île-de-France Mobilités purchased an additional 64 trainsets for fleet replacement, increasing the total contract to 371 trainsets.

In spring 2020 the first trainset started testing in the Czech Republic.

On April 26, 2023, Alstom announced the exercise of a first option for the supply of 60 additional trainsets, bringing orders to 131 trainsets.

The commissioning of the first trains of this equipment on the RER E (Z 58000) took place on November 13, 2023 at the end of the morning with a COHI mission (Haussmann - Saint-Lazare - Chelles - Gournay).

Description
The design of the RER NG is similar to Bombardier's Regio 2N trainsets with a mix of single and double-deck cars. The single-level end cars are designed to offer level boarding that accommodates disabled passengers who are unable to use stairs and standing passengers traveling short distances. The double-deck intermediate cars accommodate seated passengers traveling longer distances.

RER NG trainsets will have two configurations:
 * 130 six-car trainsets for the RER E line with two single-level cars with cabs and motors, two bi-level cars with motors, and two unpowered bi-level cars at a total length of 112 m.
 * 125 seven-car trainsets for the RER D line with two single-level cars with cabs and motors, two bi-level cars with motors, and three unpowered bi-level cars at a total length of 130 m.

The single-level end cars are 20 m long, with two doors per side (one 1.3 m wide and one 1.95 m wide). The double-deck intermediate cars will each have two doors per side. The doors located just behind the driving cabs are fitted with gap fillers to enable level boarding for passengers using a mobility device, like a wheelchair.

RER NG trainsets will have open-gangways allowing passengers to travel from one end of the trainset to the other, allowing more an even distribution of passengers on board, reducing crowding during peak periods. Unlike some other open-gangway trainsets, the RER NG will not use a jacobs bogie between cars, but rather a conventional architecture, each car having two bogies.

Like all RER trains since the MI 84, the RER NG is required to meet strict acceleration standards, being able to fully depart a 225 m platform in 23 seconds. Despite the fact that the RER NG is heavier and up to 17 m longer than a MI 84, it is able to meet this standard with its 8 or 10 motorised bogies.

The maximum top speed for the RER NG in service is 140 km/h. During testing speeds of 160 km/h were reached.

The RER NG should be equipped with the NExTEO system for operating the central section of the RER E. With this system, the train will be able to travel at 120 km/h in the tunnels of the central section of the RER E.

Formations
, at least 3 Z58000 trainsets were in tests.

Six-car trainsets are planned for RER E. They will be based at Noisy-le-Sec and Nanterre SNCF depots.

As shown below, they will be formed with four motorised cars and two non-powered trailer cars.


 * show a pantograph. Cars 1 and 6 are each equipped with one pantograph.
 * All cars are connected by gangway.

Seven-car trainsets are planned for RER D. They will be based at Villeneuve and Joncherolles SNCF depots.

As shown below, they will be formed with four motorised cars and three non-powered trailer cars.


 * show a pantograph. Cars 1 and 7 are each equipped with one pantograph.
 * All cars are connected by gangway.