SOFRETU (Société française d'études et de réalisations de transports urbains) was a French transport consulting and project development firm created in 1961 by the RATP.[1][2]
It has been merged with Sofrerail - a SNCF branch, in 1995 and became Systra.
It has been notably involved in the metro planning for Montréal, Mexico City, Santiago de Chile and Tehran.
References
- Andra B. Chastain. Latin American Subways and Metro Systems Oxford Research Encyclopedia of Latin American History, 2024-12-11, retrieved 2025-04-18^
- History systra.com, retrieved 2025-04-18^