| Today | SYSTRA USA is part of the SYSTRA Group, a global enterprise with staff resources of more than 2,500 employees and a 50-year history in developing and improving transportation systems |
| 1994 | SYSTRA USA SOFRETU and SOFRERAIL merged, and in 1994, LSTS and RTS joined forces under the holding structure of SYSTRA USA Inc., which includes SYSTRA Consulting, headquartered in Little Falls, NJ, and SYSTRA Engineering located in New York, NY |
| 1989 | Rail Transportation Systems The US domestic affiliate of SOFRERAIL, Rail Transportation Systems (RTS) was formed |
| 1985 | LS Transit Systems US domestic affiliate of SOFRETU, LS Transit Systems (LSTS), was created |
| 1961 | SOFRETU Société d’Etudes et de Réalisations de Transports Urbains (SOFRETU) was founded by RATP, the Paris transit operator |
| 1957 | SOFRERAIL Société d’Etudes et de Réalisations Ferroviaires (SOFRERAIL) was founded by SNCF |