SNCF Class Z 50000 SNCF Class Z 50000 The SNCF Z 50000 is an electric multiple unit train built by Bombardier Transportation (manufacturer's designation SPACIUM 3.O6) for the French rail operator SNCF, for use under Transilien operations in the Île-de-France. It is commonly called ‘Francilien’, and sometimes ‘NAT’ (for , which was its project name). In 2004, the STIF (regional transit authority) began the tendering process for approximately 180 new EMUs to replace SNCF's aging stainless-steel single-deck suburban fleet. This stock nicknamed "inox " (short for "[acier] inoxydable": stainless steel) comprised EMUs Classes Z 5300, Z 6100, Z 6400 and similar push-pull trainsets known
SNCF Class BB 15000 with the BB7200 and BB22200 series and have even a great deal in common with cabs of other SNCF locomotives of the 1960s. This class was also the first to introduce the VI ("Vitesse Imposée") cruise control system which is now standard on all SNCF locomotives delivered after 1971. The electrical part consists of a single pantograph (type AM18U) which collects 25 kV from the catenary. Power is passed through a transformer which lowers the tension to about 1500 V AC and a bridge rectifier controlled by thyristors rectify it into DC, which is then fed into the traction motors.