ICTS is Intermediate Capacity Transit System which is used in metro.It is also known as ART which is Advanced Rapid Transit.It was first manufactured by Bombardier Transportation.The original versions looked like small subway cars that typically ran in two or four car trains, but the latest versions are more adnanced two-car articulated designs that are not easily uncouplef. ART systems 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. The design was originally developed in the 1970s by the UTDC, an Ontario,Canada Crown Corporation, a subway at the high-end. During development the system was known as the ICTS, for ''Intermediate Capacity Transit System''. Sales of the ICTS were made to metro lines in Vancouver, Toronto,Detroit.The largest ART system today is the Vancouver SkyTrain, which has seen several major expansions over its lifetime. It is the largest completely automatic metro system in the world, with just under 70 km of track.