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Note 11 - Properties | 6 Months Ended
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Jun. 30, 2022
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 11. 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, 2022 | Cost | Depreciation | Value | Useful Life |
Land |  | $ | 5,333 |  |  | $ | N/A |  |  | $ | 5,333 |  |  |  | N/A |
Road: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rail and other track material |  |  | 18,217 |  |  |  | 6,977 |  |  |  | 11,240 |  |  |  | 43 |
Ties |  |  | 11,538 |  |  |  | 3,605 |  |  |  | 7,933 |  |  |  | 34 |
Ballast |  |  | 6,140 |  |  |  | 1,903 |  |  |  | 4,237 |  |  |  | 34 |
Other roadway [a] |  |  | 21,945 |  |  |  | 4,811 |  |  |  | 17,134 |  |  |  | 47 |
Total road |  |  | 57,840 |  |  |  | 17,296 |  |  |  | 40,544 |  |  |  | N/A |
Equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Locomotives |  |  | 9,158 |  |  |  | 3,617 |  |  |  | 5,541 |  |  |  | 18 |
Freight cars |  |  | 2,407 |  |  |  | 862 |  |  |  | 1,545 |  |  |  | 23 |
Work equipment and other |  |  | 1,191 |  |  |  | 444 |  |  |  | 747 |  |  |  | 18 |
Total equipment |  |  | 12,756 |  |  |  | 4,923 |  |  |  | 7,833 |  |  |  | N/A |
Technology and other |  |  | 1,268 |  |  |  | 539 |  |  |  | 729 |  |  |  | 13 |
Construction in progress |  |  | 876 |  |  |  | - |  |  |  | 876 |  |  |  | N/A |
Total |  | $ | 78,073 |  |  | $ | 22,758 |  |  | $ | 55,315 |  |  |  | N/A |
Millions, Except Estimated Useful Life |  |  |  | Accumulated | Net Book | Estimated |
As of December 31, 2021 | Cost | Depreciation | Value | Useful Life |
Land |  | $ | 5,339 |  |  | $ | N/A |  |  | $ | 5,339 |  |  |  | N/A |
Road: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rail and other track material |  |  | 17,980 |  |  |  | 6,844 |  |  |  | 11,136 |  |  |  | 44 |
Ties |  |  | 11,364 |  |  |  | 3,516 |  |  |  | 7,848 |  |  |  | 34 |
Ballast |  |  | 6,070 |  |  |  | 1,852 |  |  |  | 4,218 |  |  |  | 34 |
Other roadway [a] |  |  | 21,593 |  |  |  | 4,657 |  |  |  | 16,936 |  |  |  | 47 |
Total road |  |  | 57,007 |  |  |  | 16,869 |  |  |  | 40,138 |  |  |  | N/A |
Equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Locomotives |  |  | 9,371 |  |  |  | 3,779 |  |  |  | 5,592 |  |  |  | 17 |
Freight cars |  |  | 2,227 |  |  |  | 822 |  |  |  | 1,405 |  |  |  | 24 |
Work equipment and other |  |  | 1,161 |  |  |  | 411 |  |  |  | 750 |  |  |  | 18 |
Total equipment |  |  | 12,759 |  |  |  | 5,012 |  |  |  | 7,747 |  |  |  | N/A |
Technology and other |  |  | 1,209 |  |  |  | 523 |  |  |  | 686 |  |  |  | 12 |
Construction in progress |  |  | 961 |  |  |  | - |  |  |  | 961 |  |  |  | N/A |
Total |  | $ | 77,275 |  |  | $ | 22,404 |  |  | $ | 54,871 |  |  |  | N/A |
[a] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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