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Properties | 3 Months Ended
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Mar. 31, 2021
Properties [Abstract] |
Properties | 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, 2021 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,245 | $ | N/A | $ | 5,245 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,693 |  | 6,698 |  | 10,995 | 43
Ties |  | 11,121 |  | 3,387 |  | 7,734 | 34
Ballast |  | 5,956 |  | 1,785 |  | 4,171 | 34
Other roadway [a] |  | 21,058 |  | 4,386 |  | 16,672 | 48
Total road |  | 55,828 |  | 16,256 |  | 39,572 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,322 |  | 3,605 |  | 5,717 | 17
Freight cars |  | 2,157 |  | 801 |  | 1,356 | 25
Work equipment and other |  | 1,108 |  | 361 |  | 747 | 18
Total equipment |  | 12,587 |  | 4,767 |  | 7,820 | N/A
Technology and other |  | 1,211 |  | 535 |  | 676 | 12
Construction in progress |  | 749 |  | - |  | 749 | N/A
Total | $ | 75,620 | $ | 21,558 | $ | 54,062 | 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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