SNCF Class Z 27500

The Z 27500 is a type of dual-voltage electric multiple unit trainset for the French National Railway Company (SNCF) intended to the TER network (French commuter rail).
The train is the electric variant of Bombardier AGC, often referred to as ZGC. It the most important fleet of all other AGC variants. It is capable of operating on a 1.5 kV DC or 25 kV AC electricity supply. 
A total of 211 trainsets have been built by Canadian conglomerate Bombardier at its factory in Crespin (near Valenciennes, France) since 2005. The first set (Z 27503/27504) was placed into regular passenger service on March 24, 2005 for the Basse-Normandie region.
Design.
Bombardier vehicle design is articulated using bogies between carriages. The Z 27500 are available in three or four-car unit. The train can be operated as a multiple-unit control with up to three units, with other Z 27500 or the dual-mode version Diesel/1.5kV DC (B 81500). The train is equipped with 2 pantographs on the intermediate car.
Their capacity offers 160 seats in a three-car unit, 220 in a four-car set. The inter-carriage passages have wide, open gangway connections, limiting bottlenecking.
The Z 27500 from Lorraine region can be operated as a multiple-unit control with the Diesel variant (X 76500), specifically equipped with a command to raise the pantograph.
Whereas the first trains were delivered in their three-car set version (with an intermediate car), several regions later added a second intermediate car, in order to increase their capacity from 160 to 220 seats.
Future.
SNCF has announced on March 18, 2021 that 40 % of the TER (French commuter rail) fleet will be renovated in the next 10 years, included Z 27500 Class.