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Investment in Affiliates and Related-Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2025
Related Party Transactions [Abstract]  
Schedule of Equity-method Investments in Affiliates
CSX's investments in affiliates are included on the consolidated balance sheet as investments in affiliates and other companies.
 DecemberDecember
(Dollars in Millions)20252024
Conrail$1,301 $1,245 
TTX1,055 1,012 
Other Investments in Affiliates278 263 
Total$2,634 $2,520 
Schedule of Future Payments Under Shared Asset Area Agreements
The following table presents information about future lease payments and balances related to operating leases as of December 31, 2025.
(Dollars in Millions)December 2025
Maturity of Lease LiabilitiesLease Payments
2026$69 
202762 
202849 
202944 
203039 
Thereafter1,055 
Total Undiscounted Operating Lease Payments$1,318 
Less: Imputed Interest(772)
Present Value of Operating Lease Liabilities$546 
Future payments due to Conrail under the shared asset area agreements are shown in the table below.
(Dollars in Millions)Conrail Shared
YearsAsset Agreement
2026$39 
202739 
202839 
202916 
2030— 
Thereafter— 
Total$133 
Schedule of Related Party Transactions
The following table discloses amounts related to Conrail. All amounts in the table below are included in purchased services and other expenses on the Company’s consolidated income statements.

 Years Ended
(Dollars in Millions)202520242023
Rents, Fees and Services$134 $142 $132 
Purchase Price Amortization and Other4 4 4 
Equity Earnings of Conrail(57)(69)(54)
Total Conrail Expense$81 $77 $82 
 DecemberDecember
(Dollars in Millions)20252024
Balance Sheet Information:  
CSX Accounts Payable to Conrail$214 $172 
Promissory Notes Payable to Conrail Subsidiary  
1.31% CSX Promissory Note due December 2050
73 73 
1.31% CSXT Promissory Note due December 2050
368 368 
As required by the Related Party Disclosures Topic in the ASC, the following table discloses amounts related to TTX. Car hire rents and equity earnings are included in equipment and other rents expense on the Company’s consolidated income statement.

 Years Ended
(Dollars in Millions)202520242023
Income Statement Information:
Car Hire Rents$277 $256 $249 
Equity Earnings of TTX(43)(50)(49)
Total TTX Expense$234 $206 $200 
Also included below is balance sheet information related to CSX's payable to TTX, which represents car rental liabilities.

(Dollars in Millions)DecemberDecember
Balance Sheet Information:20252024
CSX Payable to TTX$47 $44