| OUTSIDE PLANT RELIANT ENGINEERING LLCJacksonville, FL · Active | Jacksonville, FL | LLC | Apr 22, 2014 | Active |
| RESIDUAL ENTERPRISES CORPORATIONJacksonville, FL · Active | Jacksonville, FL | Corporation | Aug 9, 2007 | Active |
| GEORGETOWN AND HIGH LINE RAILWAY COMPANY, LLCJacksonville, FL · Active | Jacksonville, FL | LLC | May 8, 2007 | Active |
| CSX TRANSPORTATION INTERNATIONAL, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Apr 24, 2007 | Active |
| CSX EQUIPMENT LEASING, LLCJacksonville, FL · Active | Jacksonville, FL | LLC | Jan 8, 2003 | Active |
| REAL ESTATE AND IMPROVEMENT COMPANY OF BALTIMORE CITYJacksonville, FL · Active | Jacksonville, FL | Corporation | Feb 19, 2002 | Active |
| CHESSIE COMPUTER SERVICES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Aug 8, 2000 | Active |
| FRUIT GROWERS EXPRESS COMPANYJacksonville, FL · Active | Jacksonville, FL | Corporation | Oct 19, 1920 | Active |
| THE ATLANTIC LAND AND IMPROVEMENT COMPANYJacksonville, FL · Active | Jacksonville, FL | Corporation | Aug 11, 1927 | Active |
| SEABOARD COAST LINE RAILWAY SUPPLIES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Jun 2, 1978 | Active |
| GREENWAY TRANSPORTATION, INC.Jacksonville, FL · Inactive | Jacksonville, FL | Corporation | Aug 2, 2022 | Inactive |
| TRANSFLO TERMINAL SERVICES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Sep 27, 1995 | Active |
| TOTAL DISTRIBUTION SERVICES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Nov 1, 1995 | Active |
| CYBERNETICS & SERVICES, INC.Jacksonville, FL · Inactive | Jacksonville, FL | Corporation | Dec 1, 1995 | Inactive |
| CSX TECHNOLOGY, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Dec 22, 1995 | Active |
| CSX NON-RAIL PAYROLL SERVICES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Jul 15, 1997 | Active |
| CSX RAIL PAYROLL SERVICES, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Jul 15, 1997 | Active |
| CSX REALTY DEVELOPMENT, LLCJacksonville, FL · Active | Jacksonville, FL | LLC | Aug 21, 1997 | Active |
| CSX INTERMODAL TERMINALS, INC.Jacksonville, FL · Active | Jacksonville, FL | Corporation | Sep 21, 1989 | Active |