They are distinguished from their predecessors, Matra VAL256, by their circular front headlights and a grey livery, with a green stripe above.

They were originally numbered from 52 to 152, continuing the sequence from the first-generation Matra-made sets, but in order to distinguish between the newer and older trains, they were renumbered from 101 onwards.

In May 2015, the Chicago O'Hare Airport Transit System (ATS) awarded Bombardier with a contract to supply 36 Innovia APM 256 vehicles, replacing all VAL 256 vehicles currently in service.

[4] The ATS was initially shut down for complete overhaul on 8 January 2019 and was expected to open in Autumn 2019, however this was delayed[5] to 3 November 2021.

[1] Media related to Bombardier Innovia APM 256 at Wikimedia Commons