SNCF Class Z 20500

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Z 20500
Z 20500 trainset operating on the Transilien Line P line at Gare de l'Est
In service	1988–present
Manufacturer	ANF, CIMT [fr], and GEC Alsthom[1]
Family name	Z 2N series
Constructed	1988–1998
Entered service	20 September 1988
Refurbished	2007–2016, 2019–2023
Number built	200 trainsets (934 cars)
Number in service	200
Formation	4 or 5 cars per trainset:     66 trainsets with 4 cars     134 trainsets with 5 cars
Fleet numbers	Z 20501/2 to 20899/900
Operators	SNCF (RER and Transilien)
Depots	Joncherolles Les Ardoines Noisy-le-Sec Villeneuve-Saint-Georges
Lines served
Specifications
Car body construction	Copper steel Stainless steel
Width	2.82 m (9 ft 3 in)
Height	4.32 m (14 ft 2 in)
Doors	2 pairs per side, per car
Maximum speed	140 km/h (87 mph)
Weight	Motor cars: 69 t (152,000 lb) Trailer cars: 43 t (95,000 lb)
Traction system	GEC Alsthom thyristor chopper and thyristor phase sequence inverter
Traction motors	8x asynchronous (4 FHA 2870)
Power output	2,800 kW (3,800 hp)
Transmission	Gear wheel, hollow shaft and cardan shaft, 4.18 ratio
Acceleration	1 m/s2 (3.3 ft/s2) 4 cars 0.77 m/s2 (2.5 ft/s2) 5 cars
Deceleration	0.85 m/s2 (2.8 ft/s2) (service) 0.95 m/s2 (3.1 ft/s2) (emergency)
Electric system(s)	Overhead line:     25 kV 50 Hz AC     1,500 V DC
Current collector(s)	Pantograph (type AM 91BU)
Bogies	type Y401(motor)/Y30PL(trailer), H shape
Braking system(s)	Electrodynamic
Safety system(s)	Crocodile, KVB
Coupling system	Scharfenberg type
Multiple working	Other Z 2N series trains (Z 5600, Z 8800, Z 20500, Z 20900)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The SNCF Class Z 20500 is a double-deck, dual-voltage electric multiple unit trainset that are operated by SNCF on the Réseau Express Régional (RER), a hybrid suburban commuter and rapid transit system and the Transilien, a suburban commuter rail system, both serving Paris and its Île-de-France suburbs.

The 200 trains were built by a consortium of French manufacturer Alstom (then known as GEC Alsthom), ANF Industrie (which would be purchased by Bombardier in 1989 before the end of the deliveries), and Compagnie industrielle de matériel de transport [fr] (CIMT). The final assembly of the trains took place between 1988 and 1998.

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