FORM 10-Q(☒)QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR (☐)TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from __________ to __________ Commission File Number 1-8022 CSX CORPORATION (Exact name of registrant as specified in its charter) 62-1051971 Nasdaq Global Select Market Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject tosuch filing requirements for the past 90 days.Yes (X) No ( ) Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and postedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrantwas required to submit such files).Yes (X) No ( ) Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company (as defined in Exchange Act Rule 12b-2). Large Accelerated Filer (X)Accelerated Filer ( )Non-accelerated Filer ( )Smaller Reporting Company (☐) Emerging growth company (☐) If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ( ) Indicate by a check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes (☐) No (X) There were 1,858,138,856 shares of common stock outstanding on March31, 2026 (the latest practicable date that is closest to the filing date). CSX CORPORATIONFORM 10-QFOR THE QUARTERLY PERIOD ENDED MARCH31, 2026INDEX PART I.FINANCIAL INFORMATION Item 1.Financial StatementsConsolidated Income Statements (Unaudited)-Quarters Ended March31, 2026 and March31, 2025Condensed Consolidated Comprehensive Income Statements (Unaudited)-Quarters Ended March31, 2026 and March31, 2025Consolidated Balance Sheets-At March31, 2026 (Unaudited) and December31, 2025Consolidated Cash Flow Statements (Unaudited)-Three Months Ended March31, 2026 and March31, 2025Consolidated Statements of Changes in Shareholders' Equity (Unaudited)-Quarters Ended March31, 2026 and March31, 2025Notes to Consolidated Financial Statements (Unaudited)Item 2.Management's Discussion and Analysis of Financial Condition and Results of OperationsItem 3.Quantitative and Qualitative Disclosures about Market RiskItem 4.Controls and ProceduresPART II.OTHER INFORMATIONItem 1.Legal ProceedingsItem 1A.Risk FactorsItem 2.CSX Purchases of Equity SecuritiesItem 3.Defaults Upon Senior SecuritiesItem 4.Mine Safety DisclosuresItem 5.Other InformationItem 6.ExhibitsSignature CSX Q1 2026 Form 10-Q p.2 CONSOLIDATED INCOME STATEMENTS(Unaudited)(Dollars in Millions, Except Per Share Amounts) RevenueExpenseLabor and FringePurchased Services and OtherDepreciation and AmortizationFuelEquipment and Other RentsTotal Expense Operating Income Interest ExpenseOther Income - NetEarnings Before Income Taxes Income Tax ExpenseNet Earnings Per Common Share (Note 2)Net Earnings Per Share, BasicNet Earnings Per Share, Assuming Dilution Average Shares Outstanding(In Millions)Average Shares Outstanding, Assuming Dilution(In Millions) See accompanying notes to consolidated financial statements. CONSOLIDATED BALANCE SHEETS(Dollars in Millions) Current Assets: Cash and Cash EquivalentsShort-term Investments (Note 9)Accounts Receivable - Net (Note 8)Materials and SuppliesOther Current Assets PropertiesAccumulated Depreciation Properties - Net Investment in Affiliates and Other CompaniesRight-of-Use Lease AssetGoodwill and Other Intangible Assets - NetOther Long-term Assets Total Assets Current Liabilities: Accounts PayableLabor and Fringe Benefits PayableCasualty, Environmental and Other Reserves (Note 4)Current Maturities of Long-term Debt (Note 7)Income and Other Taxes PayableInterest PayableOther Current LiabilitiesTotal Current Liabilities Casualty, Environmental and Other Reserves (Note 4)Long-term Debt (Note 7)Deferred Income Taxes - NetLong-term Lease LiabilityOther Long-term Liabilities Shareholders' Equity: See accompanying notes to consolidated financial statements. CSX Q1 2026 Form 10-Q p.4 CONSOLIDATED CASH FLOW STATEMENTS(Unaudited)(Dollars in Millions) OPERATING ACTIVITIES INVESTING ACTIVITIES Property AdditionsPurchases of Short-Term InvestmentsProceeds from Sales of Short-term InvestmentsProceeds and Advances from Property DispositionsOther Investing Activities Certain prior year data has been reclassified t