Conrail Shared Assets Operations (CSAO) is a freight railroad service that operates in the northeastern United States. It was established in 1999 to manage the shared use of rail lines previously owned by Conrail, which was split between CSX Transportation and Norfolk Southern. CSAO provides rail services to various customers, including industries and other railroads, by maintaining and operating key rail lines in New Jersey and Pennsylvania. The organization focuses on efficient operations, ensuring that freight moves smoothly across shared tracks while supporting local economies and businesses.