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Properties | 9 Months Ended
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Sep. 30, 2020
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, 2020 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,274 | $ | N/A | $ | 5,274 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,521 |  | 6,550 |  | 10,971 | 42
Ties |  | 10,997 |  | 3,294 |  | 7,703 | 34
Ballast |  | 5,893 |  | 1,723 |  | 4,170 | 34
Other roadway [a] |  | 20,759 |  | 4,259 |  | 16,500 | 48
Total road |  | 55,170 |  | 15,826 |  | 39,344 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,427 |  | 3,548 |  | 5,879 | 17
Freight cars |  | 2,082 |  | 790 |  | 1,292 | 25
Work equipment and other |  | 1,101 |  | 340 |  | 761 | 18
Total equipment |  | 12,610 |  | 4,678 |  | 7,932 | N/A
Technology and other |  | 1,176 |  | 508 |  | 668 | 12
Construction in progress |  | 1,157 |  | - |  | 1,157 | N/A
Total | $ | 75,387 | $ | 21,012 | $ | 54,375 | 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 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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