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Properties | 3 Months Ended
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Mar. 31, 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 March 31, 2020 | Cost | Depreciation | Value | Useful Life
Land | $ | 5,275 | $ | N/A | $ | 5,275 | N/A
Road: |  |  |  |  |  |  |
Rail and other track material |  | 17,288 |  | 6,440 |  | 10,848 | 42
Ties |  | 10,793 |  | 3,230 |  | 7,563 | 34
Ballast |  | 5,798 |  | 1,687 |  | 4,111 | 34
Other roadway [a] |  | 20,486 |  | 4,124 |  | 16,362 | 48
Total road |  | 54,365 |  | 15,481 |  | 38,884 | N/A
Equipment: |  |  |  |  |  |  |
Locomotives |  | 9,456 |  | 3,453 |  | 6,003 | 18
Freight cars |  | 2,089 |  | 783 |  | 1,306 | 24
Work equipment and other |  | 1,094 |  | 330 |  | 764 | 18
Total equipment |  | 12,639 |  | 4,566 |  | 8,073 | N/A
Technology and other |  | 1,193 |  | 490 |  | 703 | 12
Construction in progress |  | 1,186 |  | - |  | 1,186 | N/A
Total | $ | 74,658 | $ | 20,537 | $ | 54,121 | 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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- References No definition available. + Details
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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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