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Properties (Tables) | 12 Months Ended
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Dec. 31, 2020
Properties [Abstract] |
Schedule Of 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 December 31, 2020 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,246 | $ | N/A | $ | 5,246 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,620 |  | 6,631 |  | 10,989 | 42
Ties |  | 11,051 |  | 3,331 |  | 7,720 | 34
Ballast |  | 5,926 |  | 1,753 |  | 4,173 | 34
Other roadway [a] |  | 21,030 |  | 4,329 |  | 16,701 | 48
Total road |  | 55,627 |  | 16,044 |  | 39,583 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,375 |  | 3,555 |  | 5,820 | 17
Freight cars |  | 2,118 |  | 789 |  | 1,329 | 25
Work equipment and other |  | 1,107 |  | 351 |  | 756 | 18
Total equipment |  | 12,600 |  | 4,695 |  | 7,905 | N/A
Technology and other |  | 1,199 |  | 520 |  | 679 | 13
Construction in progress |  | 748 |  | - |  | 748 | N/A
Total | $ | 75,420 | $ | 21,259 | $ | 54,161 | N/A
Millions, Except Estimated Useful Life |  | Accumulated | Net Book | Estimated
As of December 31, 2019 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,276 | $ | N/A | $ | 5,276 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,178 |  | 6,381 |  | 10,797 | 42
Ties |  | 10,693 |  | 3,186 |  | 7,507 | 34
Ballast |  | 5,752 |  | 1,669 |  | 4,083 | 34
Other roadway [a] |  | 20,331 |  | 4,056 |  | 16,275 | 48
Total road |  | 53,954 |  | 15,292 |  | 38,662 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,467 |  | 3,434 |  | 6,033 | 18
Freight cars |  | 2,083 |  | 779 |  | 1,304 | 25
Work equipment and other |  | 1,081 |  | 322 |  | 759 | 18
Total equipment |  | 12,631 |  | 4,535 |  | 8,096 | N/A
Technology and other |  | 1,136 |  | 503 |  | 633 | 12
Construction in progress |  | 1,249 |  | - |  | 1,249 | N/A
Total | $ | 74,246 | $ | 20,330 | $ | 53,916 | N/A
[a]Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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