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Note 10 - Properties | 3 Months Ended
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Mar. 31, 2022
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 March 31, 2022 |  | Cost |  |  | Depreciation |  |  | Value |  |  | Useful Life |
Land |  | $ | 5,336 |  |  | $ | N/A |  |  | $ | 5,336 |  |  |  | N/A |
Road: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rail and other track material |  |  | 18,102 |  |  |  | 6,910 |  |  |  | 11,192 |  |  |  | 43 |
Ties |  |  | 11,455 |  |  |  | 3,563 |  |  |  | 7,892 |  |  |  | 34 |
Ballast |  |  | 6,104 |  |  |  | 1,878 |  |  |  | 4,226 |  |  |  | 34 |
Other roadway [a] |  |  | 21,791 |  |  |  | 4,730 |  |  |  | 17,061 |  |  |  | 47 |
Total road |  |  | 57,452 |  |  |  | 17,081 |  |  |  | 40,371 |  |  |  | N/A |
Equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Locomotives |  |  | 9,230 |  |  |  | 3,660 |  |  |  | 5,570 |  |  |  | 18 |
Freight cars |  |  | 2,339 |  |  |  | 839 |  |  |  | 1,500 |  |  |  | 23 |
Work equipment and other |  |  | 1,172 |  |  |  | 428 |  |  |  | 744 |  |  |  | 18 |
Total equipment |  |  | 12,741 |  |  |  | 4,927 |  |  |  | 7,814 |  |  |  | N/A |
Technology and other |  |  | 1,271 |  |  |  | 523 |  |  |  | 748 |  |  |  | 13 |
Construction in progress |  |  | 795 |  |  |  | - |  |  |  | 795 |  |  |  | N/A |
Total |  | $ | 77,595 |  |  | $ | 22,531 |  |  | $ | 55,064 |  |  |  | N/A |
[a] | Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.
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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