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Properties | 9 Months Ended
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Sep. 30, 2021
Properties [Abstract] |
Properties | 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 September 30, 2021 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,283 | $ | N/A | $ | 5,283 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,882 |  | 6,790 |  | 11,092 | 43
Ties |  | 11,292 |  | 3,469 |  | 7,823 | 34
Ballast |  | 6,032 |  | 1,828 |  | 4,204 | 34
Other roadway [a] |  | 21,294 |  | 4,538 |  | 16,756 | 49
Total road |  | 56,500 |  | 16,625 |  | 39,875 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,362 |  | 3,760 |  | 5,602 | 17
Freight cars |  | 2,143 |  | 815 |  | 1,328 | 25
Work equipment and other |  | 1,126 |  | 392 |  | 734 | 18
Total equipment |  | 12,631 |  | 4,967 |  | 7,664 | N/A
Technology and other |  | 1,205 |  | 534 |  | 671 | 13
Construction in progress |  | 869 |  | - |  | 869 | N/A
Total | $ | 76,488 | $ | 22,126 | $ | 54,362 | N/A
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
[a]Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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