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Note 10 - Properties | 6 Months Ended
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Jun. 30, 2023
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 10. Properties The following tables list the major categories of property and equipment, as well as the weighted-average estimated useful life for each category (in years):
Millions, Except Estimated Useful Life |  |  |  |  |  | Accumulated |  |  | Net Book |  |  | Estimated |
As of June 30, 2023 |  | Cost |  |  | Depreciation |  |  | Value |  |  | Useful Life |
Land |  | $ | 5,365 |  |  | $ | N/A |  |  | $ | 5,365 |  |  |  | N/A |
Road: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rail and other track material |  |  | 18,633 |  |  |  | 7,222 |  |  |  | 11,411 |  |  |  | 42 |
Ties |  |  | 11,845 |  |  |  | 3,799 |  |  |  | 8,046 |  |  |  | 34 |
Ballast |  |  | 6,285 |  |  |  | 2,004 |  |  |  | 4,281 |  |  |  | 34 |
Other roadway [a] |  |  | 22,721 |  |  |  | 5,173 |  |  |  | 17,548 |  |  |  | 47 |
Total road |  |  | 59,484 |  |  |  | 18,198 |  |  |  | 41,286 |  |  |  | N/A |
Equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Locomotives |  |  | 9,319 |  |  |  | 3,690 |  |  |  | 5,629 |  |  |  | 18 |
Freight cars |  |  | 2,628 |  |  |  | 935 |  |  |  | 1,693 |  |  |  | 23 |
Work equipment and other |  |  | 1,301 |  |  |  | 508 |  |  |  | 793 |  |  |  | 17 |
Total equipment |  |  | 13,248 |  |  |  | 5,133 |  |  |  | 8,115 |  |  |  | N/A |
Technology and other |  |  | 1,280 |  |  |  | 539 |  |  |  | 741 |  |  |  | 12 |
Construction in progress |  |  | 1,134 |  |  |  | - |  |  |  | 1,134 |  |  |  | N/A |
Total |  | $ | 80,511 |  |  | $ | 23,870 |  |  | $ | 56,641 |  |  |  | N/A |
Millions, Except Estimated Useful Life |  |  |  |  |  | Accumulated |  |  | Net Book |  |  | Estimated |
As of December 31, 2022 |  | Cost |  |  | Depreciation |  |  | Value |  |  | Useful Life |
Land |  | $ | 5,344 |  |  | $ | N/A |  |  | $ | 5,344 |  |  |  | N/A |
Road: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rail and other track material |  |  | 18,419 |  |  |  | 7,096 |  |  |  | 11,323 |  |  |  | 43 |
Ties |  |  | 11,676 |  |  |  | 3,699 |  |  |  | 7,977 |  |  |  | 34 |
Ballast |  |  | 6,222 |  |  |  | 1,950 |  |  |  | 4,272 |  |  |  | 34 |
Other roadway [a] |  |  | 22,411 |  |  |  | 4,970 |  |  |  | 17,441 |  |  |  | 47 |
Total road |  |  | 58,728 |  |  |  | 17,715 |  |  |  | 41,013 |  |  |  | N/A |
Equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Locomotives |  |  | 9,166 |  |  |  | 3,606 |  |  |  | 5,560 |  |  |  | 18 |
Freight cars |  |  | 2,562 |  |  |  | 898 |  |  |  | 1,664 |  |  |  | 23 |
Work equipment and other |  |  | 1,253 |  |  |  | 473 |  |  |  | 780 |  |  |  | 17 |
Total equipment |  |  | 12,981 |  |  |  | 4,977 |  |  |  | 8,004 |  |  |  | N/A |
Technology and other |  |  | 1,254 |  |  |  | 525 |  |  |  | 729 |  |  |  | 12 |
Construction in progress |  |  | 948 |  |  |  | - |  |  |  | 948 |  |  |  | N/A |
Total |  | $ | 79,255 |  |  | $ | 23,217 |  |  | $ | 56,038 |  |  |  | N/A |
[a] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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