000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Consolidated Statements of Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Financial Position (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statements of Financial Position (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 008 - Statement - Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 1 - Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 2 - Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 3 - Operations and Segmentation link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 4 - Stock-based Compensation link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 5 - Retirement Plans link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 6 - Other Income link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 7 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 8 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 10 - Accounts Receivable link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 11 - Properties link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 13 - Financial Instruments link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 14 - Debt link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 15 - Commitments and Contingencies link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 16 - Share Repurchase Programs link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Note 17 - Related Parties link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 3 - Operations and Segmentation (Tables) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 4 - Stock-based Compensation (Tables) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 5 - Retirement Plans (Tables) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 6 - Other Income (Tables) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 8 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss (Tables) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 11 - Properties (Tables) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities (Tables) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 15 - Commitments and Contingencies (Tables) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 16 - Share Repurchase Programs (Tables) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 3 - Operations and Segmentation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 3 - Operations and Segmentation - Summary of Freight and Other Revenues (Details) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 4 - Stock-based Compensation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note 4 - Stock-based Compensation - Stock-based Compensation (Details) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note 4 - Stock-based Compensation- Stock Option Assumption (Details) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note 4 - Stock-based Compensation - Summary of Stock Option Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note 4 - Stock-based Compensation - Additional Information Regarding Stock Option Exercises (Details) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note 4 - Stock-based Compensation - Changes in Retention Awards (Details) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Note 4 - Stock-based Compensation - Changes in Performance Retention Awards (Details) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note 5 - Retirement Plans (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995492 - Disclosure - Note 5 - Retirement Plans - Components of Net Periodic Pension and OPEB Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995493 - Disclosure - Note 6 - Other Income (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995494 - Disclosure - Note 6 - Other Income - Schedule of Other Income (Details) link:calculationLink link:definitionLink link:presentationLink 995495 - Disclosure - Note 7 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995496 - Disclosure - Note 8 - Earnings Per Share - Schedule of Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 995497 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss - Schedule of Reclassification (Details) link:calculationLink link:definitionLink link:presentationLink 995498 - Disclosure - Note 9 - Accumulated Other Comprehensive Income/Loss - Schedule of Reclassification (Details) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 995499 - Disclosure - Note 10 - Accounts Receivable (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995500 - Disclosure - Note 11 - Properties (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995501 - Disclosure - Note 11 - Properties - Schedule of Property and Equipment Major Categories (Details) link:calculationLink link:definitionLink link:presentationLink 995502 - Disclosure - Note 12 - Accounts Payable and Other Current Liabilities - Schedule of Accounts Payable and Other Current Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995503 - Disclosure - Note 13 - Financial Instruments (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995504 - Disclosure - Note 14 - Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995505 - Disclosure - Note 15 - Commitments and Contingencies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995506 - Disclosure - Note 15 - Commitments and Contingencies - Personal Injury Liability Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995507 - Disclosure - Note 15 - Commitments and Contingencies - Environmental Liability Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995508 - Disclosure - Note 16 - Share Repurchase Programs (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995509 - Disclosure - Note 16 - Share Repurchase Programs - Schedule of Share Repurchase Programs (Details) link:calculationLink link:definitionLink link:presentationLink 995510 - Disclosure - Note 17 - Related Parties (Details Textual) link:calculationLink link:definitionLink link:presentationLink