Before revision: It was developed in France by GEC-Alsthom, MATRA (now part of Siemens Mobility) and CSEE (now part of Hitachi Rail STS) in the 1980s.
After revision: It was developed in France by GEC-Alsthom, Matra (now part of Siemens Mobility) and CSEE (now part of Hitachi Rail STS) in the 1980s.