SNCF Class Z 20900

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Z 20900
Z 20900 IDF Mobilités sur le RER C.jpg
A Z 20900 trainset operating on the RER C line at Neuilly – Porte Maillot station
In service2001–present
ManufacturerAlstom and Bombardier
Family nameZ 2N series
Entered serviceJuly 2001
Number in service54 trainsets (216 cars)
Formation4 cars per trainset
Fleet numbersZ 20901/2 to 21007/8
Operator(s)SNCF Transilien
Depot(s)Les Ardoines
Line(s) servedRER RER C
Car body constructionStainless steel
Train length103.508 m (339 ft 7.1 in)
Width2.820 m (9 ft 3.0 in)
Height4.32 m (14 ft 2 in)
Doors2 pairs per side, per car
Maximum speed140 km/h (87 mph)
Weight288,000 kg (635,000 lb)
Traction systemAlstom 4 FXA 2858 ONIX IGBT VVVF (liquid cooled) asynchronous motors
Power output3,464 kW (4,645 hp)
Acceleration3 km/(h⋅s) (1.9 mph/s)
Deceleration5 km/(h⋅s) (3.1 mph/s) (emergency brake)
Electric system(s)1.5 kV DC or 25 kV AC overhead catenary
Current collection methodPantograph
Braking system(s)Electrodynamic
Safety system(s)Crocodile, KVB
Coupling systemScharfenberg type
Multiple workingOther Z 2N series trains (Z 5600, Z 8800, Z 20500, Z 20900)
Track gauge1,435 mm (4 ft 8 12 in) standard gauge

The SNCF Class Z 20900 is a double-deck, dual-voltage electric multiple unit trainset that is operated on line C of the Réseau Express Régional (RER), a hybrid suburban commuter and rapid transit system serving Paris and its Île-de-France suburbs.

The 54 four-car trains were built by a consortium of French manufacturer Alstom and Canadian conglomerate Bombardier between 1998 and 2004. The first set was placed into regular passenger service in July 2001.

They are the final equipment produced as part of the Z 2N series of trainsets, which were continuously improved over several generations.

The introduction of the Z 20900 allowed for the oldest equipment on the RER C to be scrapped.


SNCF ordered the Class Z 20900 at the end of 1998 to complete the rolling stock fleet of line C and to replace the last 42 Z 5300 units still in service. The design of 54 four-car trainsets would be based on the earlier Z 20500, but with improvements in motorization, more comfortable seats, the ability for passengers to move between cars, tinted windows, and air conditioning.

These new units were delivered from July 2001 to 2004. The arrival of the Z 20900 also allowed SNCF to eliminate the first sub-series of Z 6100 in the northern Paris suburbs.

The OniX traction motor was tested on unit Z 20887-20888, and is used on all trains of this series. The two power cars (ZBe) have 82 seats while the two trailer cars (ZRBe) each have 96, as well as a toilet.

As of 2020, all of the Z 20900 trainsets are assigned to the RER C line. 40 trainsets are in the Île-de-France Mobilités livery and the other 14 are in the navy blue Transilien livery.



  • Redoutey, Denis (2007). Le matériel moteur de la SNCF. La vie du Rail. ISBN 978-2-915034-65-3.
  • Bernard Collardey, Les trains de banlieue, tome II, Éd. La Vie du Rail, 1999, 335 p. ISBN 2902808763
  • Le parc Z 20900, on via, 1er janvier 2008(in french)
  • Revue bimestrielle Voies Ferrées, Le matériel moteur de la SNCF, en plusieurs articles sur plusieurs numéros par année. (in french)
  • Revue mensuelle Rail Passion, État trimestriel du matériel moteur SNCF, un article par trimestre. (in french)
  • Lydie, « » [archive], Le blog du RER C, 24 octobre 2017 (consulté le 3 novembre 2017).(in french)
  • « » [archive], sur Le web des cheminots , article du 22 avril 2018 (consulté le 24 avril 2018) : « La 1ère à sortir du Technicentre de Saint Pierre des Corps est la Z 20905/06 (203A). Cette dernière est ressortie avec la même livrée qu'une partie des Z2N de la ligne C, à base de rouge "carmillon" de la SNCF et "vif argent" du STIF ».(in french)
  • Marc Carémantrant, « Les débuts des Z 20900 » dans Rail Passion no 51, septembre 2001, pp. 12 et 13.(in french)
  • Bernard Collardey, Les trains de banlieue, tome II, p. 302.(in french)
  • « » [archive], sur Le Web des Cheminots (consulté le 11 juin 2018).(in french)