000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Consolidated Statements of Income link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Consolidated Statements of Comprehensive Income link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Consolidated Statements of Comprehensive Income (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Consolidated Statements of Financial Position link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Consolidated Statements of Financial Position (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Consolidated Statements of Cash Flows link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Consolidated Statements of Changes in Common Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 008 - Statement - Consolidated Statements of Changes in Common Shareholders' Equity (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Cybersecurity Disclosure Information link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 1 - Nature of Operations link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 2 - Significant Accounting Policies link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 3 - Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 4 - Stock Options and Other Stock Plans link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 5 - Retirement Plans link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 6 - Other Income link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 7 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 8 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 10 - Accounts Receivable link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 11 - Properties link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 13 - Financial Instruments link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 14 - Debt link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 15 - Variable Interest Entities link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Note 16 - Leases link:calculationLink link:definitionLink link:presentationLink 026 - Disclosure - Note 17 - Commitments and Contingencies link:calculationLink link:definitionLink link:presentationLink 027 - Disclosure - Note 18 - Share Repurchase Programs link:calculationLink link:definitionLink link:presentationLink 028 - Disclosure - Note 19 - Related Parties link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 1 - Nature of Operations (Tables) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 2 - Significant Accounting Policies (Tables) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 4 - Stock Options and Other Stock Plans (Tables) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 5 - Retirement Plans (Tables) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 6 - Other Income (Tables) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 7 - Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 8 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss (Tables) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 11 - Properties (Tables) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities (Tables) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note 14 - Debt (Tables) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note 16 - Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note 17 - Commitments and Contingencies (Tables) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note 18 - Share Repurchase Programs (Tables) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Cybersecurity Disclosure Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note 1 - Nature of Operations (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995492 - Disclosure - Note 1 - Nature of Operations - Summary of Freight and Other Revenues (Details) link:calculationLink link:definitionLink link:presentationLink 995493 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995494 - Disclosure - Note 2 - Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) link:calculationLink link:definitionLink link:presentationLink 995495 - Disclosure - Note 4 - Stock Options and Other Stock Plans (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995496 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Stock-based Compensation (Details) link:calculationLink link:definitionLink link:presentationLink 995497 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Stock Option Assumption (Details) link:calculationLink link:definitionLink link:presentationLink 995498 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Summary of Stock Option Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995499 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Additional Information Regarding Stock Option Exercises (Details) link:calculationLink link:definitionLink link:presentationLink 995500 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Changes in Retention Awards (Details) link:calculationLink link:definitionLink link:presentationLink 995501 - Disclosure - Note 4 - Stock Options and Other Stock Plans - Changes in Performance Retention Awards (Details) link:calculationLink link:definitionLink link:presentationLink 995502 - Disclosure - Note 5 - Retirement Plans (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995503 - Disclosure - Note 5 - Pension and Other Postretirement Benefits - Changes in PBO and Plan Assets (Details) link:calculationLink link:definitionLink link:presentationLink 995504 - Disclosure - Note 5 - Retirement Plans - Amounts Recognized in the Statement of Financial Position (Details) link:calculationLink link:definitionLink link:presentationLink 995505 - Disclosure - Note 5 - Retirement Plans - Pre-tax Changes Recognized in Other Comprehensive Income (Loss) (Details) link:calculationLink link:definitionLink link:presentationLink 995506 - Disclosure - Note 5 - Retirement Plans - Accumulated Benefit Obligation (Details) link:calculationLink link:definitionLink link:presentationLink 995507 - Disclosure - Note 5 - Retirement Plans - Weighted Average Actuarial Assumptions (Details) link:calculationLink link:definitionLink link:presentationLink 995508 - Disclosure - Note 5 - Retirement Plans - Components of Net Periodic Pension and OPEB Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995509 - Disclosure - Note 5 - Retirement Plans - Cash Contributions (Details) link:calculationLink link:definitionLink link:presentationLink 995510 - Disclosure - Note 5 - Retirement Plans - Benefit Payments (Details) link:calculationLink link:definitionLink link:presentationLink 995511 - Disclosure - Note 5 - Retirement Plans - Pension Plan Asset Allocation (Details) link:calculationLink link:definitionLink link:presentationLink 995512 - Disclosure - Note 5 - Retirement Plans - Plan Assets Measured At Fair Value (Details) link:calculationLink link:definitionLink link:presentationLink 995513 - Disclosure - Note 6 - Other Income (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995514 - Disclosure - Note 6 - Other Income - Schedule of Other Income (Details) link:calculationLink link:definitionLink link:presentationLink 995515 - Disclosure - Note 7 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995516 - Disclosure - Note 7 - Income Taxes - Schedule of Income Tax Expense Components (Details) link:calculationLink link:definitionLink link:presentationLink 995517 - Disclosure - Note 7 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 995518 - Disclosure - Note 7 - Income Taxes - Schedule of Deferred Income Tax Assets (Liabilities) (Details) link:calculationLink link:definitionLink link:presentationLink 995519 - Disclosure - Note 7 - Income Taxes - Schedule of Unrecognized Tax Benefits Assets (Liabilities) (Details) link:calculationLink link:definitionLink link:presentationLink 995520 - Disclosure - Note 8 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995521 - Disclosure - Note 8 - Earnings Per Share - Schedule of Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 995522 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss - Schedule of Reclassification (Details) link:calculationLink link:definitionLink link:presentationLink 995523 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss - Schedule of Reclassification (Details) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 995524 - Disclosure - Note 10 - Accounts Receivable (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995525 - Disclosure - Note 11 - Properties (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995526 - Disclosure - Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) link:calculationLink link:definitionLink link:presentationLink 995527 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities - Schedule of Accounts Payable and Other Current Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995528 - Disclosure - Note 13 - Financial Instruments (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995529 - Disclosure - Note 14 - Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995530 - Disclosure - Note 14 - Debt - Schedule of Debt (Details) link:calculationLink link:definitionLink link:presentationLink 995531 - Disclosure - Note 14 - Debt - Schedule of Debt (Details) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 995532 - Disclosure - Note 14 - Debt - Schedule of Debt Maturities (Details) link:calculationLink link:definitionLink link:presentationLink 995533 - Disclosure - Note 14 - Debt - Schedule of Unsecured Debt (Details) link:calculationLink link:definitionLink link:presentationLink 995534 - Disclosure - Note 14 - Debt - Schedule of Unsecured Debt (Details) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 995535 - Disclosure - Note 15 - Variable Interest Entities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995536 - Disclosure - Note 16 - Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995537 - Disclosure - Note 16 - Leases - Schedule of Lessee's Assets and Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995538 - Disclosure - Note 16 - Leases - Schedule of Lease Costs (Details) link:calculationLink link:definitionLink link:presentationLink 995539 - Disclosure - Note 16 - Leases - Schedule of Lease Maturities (Details) link:calculationLink link:definitionLink link:presentationLink 995540 - Disclosure - Note 16 - Leases - Schedule of Leases Term and Discount Rate (Details) link:calculationLink link:definitionLink link:presentationLink 995541 - Disclosure - Note 16 - Leases - Schedule of Other Lease Information (Details) link:calculationLink link:definitionLink link:presentationLink 995542 - Disclosure - Note 17 - Commitments and Contingencies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995543 - Disclosure - Note 17 - Commitments and Contingencies - Personal Injury Liability Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995544 - Disclosure - Note 17 - Commitments and Contingencies - Environmental Liability Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995545 - Disclosure - Note 18 - Share Repurchase Programs (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995546 - Disclosure - Note 18 - Share Repurchase Programs - Schedule of Share Repurchase Programs (Details) link:calculationLink link:definitionLink link:presentationLink 995547 - Disclosure - Note 19 - Related Parties (Details Textual) link:calculationLink link:definitionLink link:presentationLink