SNCF Class Z 20900

Z 20900
A Z 20900 trainset operating on the RER C line at Neuilly – Porte Maillot station
In service	12 June 2001–present
Manufacturers	Alstom and Bombardier
Family name	Z 2N series, X'Trapolis Tagus
Replaced	Z5300
Constructed	2001–2004
Entered service	12 June 2001
Refurbished	2019–2023
Number in service	54 trainsets (216 cars)
Successor	Z 2N-NG
Formation	4 cars per trainset
Fleet numbers	Z 20901/2 to 21007/8
Operator	SNCF Transilien
Depot	Les Ardoines
Line served
Specifications
Car body construction	Copper steel Stainless steel
Train length	103.508 m (339 ft 7.1 in)
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	245,000 kg (540,000 lb)
Traction system	Alstom OniX IGBT–VVVF
Traction motors	8 × 4 FXA 2858 (asynchronous motors)
Power output	3,464 kW (4,645 hp)
Transmission	Gear wheel, hollow shaft and cardan shaft, ratio : 4.18
Acceleration	1 m/s2 (3.3 ft/s2)
Deceleration	0.95 m/s2 (3.1 ft/s2) (service) 0.95 m/s2 (3.1 ft/s2) (emergency)
Electric systems	Overhead line:     25 kV 50 Hz AC     1,500 V DC
Current collection	Pantograph Type AM18
Bogies	type Y401(motor)/Y30PL(trailer), H shape
Braking system	Electrodynamic regeneratif
Safety systems	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 20900 is a double-deck, dual-voltage electric multiple unit (EMU) trainset operated on RER C of the Réseau Express Régional (RER), a hybrid suburban commuter and rapid transit system serving Paris and its Île-de-France suburbs.

Fifty-four four-car trainsets were built by a consortium of Alstom and Bombardier Transportation between 2001 and 2004. The first set entered passenger service in July 2001. They were the final trains produced in the Z 2N series, which had been developed over several generations. Their introduction enabled the withdrawal of older rolling stock from RER C.