High Quality Content by WIKIPEDIA articles! Innovia Metro (stylized as INNOVIA Metro) is the current name given to an automated rapid transit system manufactured by Bombardier Transportation. The original versions look like small subway cars that typically run in two-, four- or six-car trains, but the latest versions are more streamlined two-car articulated designs that are not easily uncoupled. Innovia Metro systems currently in operation run on conventional metal rails and pull power from a third rail, but are powered by a linear induction motor that provides traction by pulling on a "fourth rail" placed between the running rails. A new version of the technology being marketed by Bombardier is compatible with standard electric rotary propulsion.