Directorate General of Telecommunications and electrical signals

Railway Headquarters Tehran

Railway Headquarters North West

Southern Railway Administration

Railway Headquarters Hormozgan

Railway Headquarters Branch

Railway Headquarters Zagros

Railway Headquarters in Lorestan

Railway Headquarters Khorasan

Railway Headquarters North East

Tehran subway operation company

Tehran subway operation company

Shiraz Urban Railway Organization

Tabriz Urban Railway Organization

Mobarakeh Steel Company