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Properties (Tables) | 3 Months Ended
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Mar. 31, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Property and Equipment and Weighted Average Estimated Useful Life | 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 As of March 31, 2025 | Cost | Accumulated depreciation | Net book value | Estimated useful life
Land | $ | 5,449 |  | N/A | $ | 5,449 |  | N/A
Road: |  |  |  |
Rail and other track material | 19,392 |  | $ | 7,717 |  | 11,675 |  | 45
Ties | 12,473 |  | 4,166 |  | 8,307 |  | 34
Ballast | 6,531 |  | 2,216 |  | 4,315 |  | 34
Other roadway [a] | 24,041 |  | 5,793 |  | 18,248 |  | 47
Total road | 62,437 |  | 19,892 |  | 42,545 |  | N/A
Equipment: |  |  |  |
Locomotives | 9,731 |  | 3,785 |  | 5,946 |  | 18
Freight cars | 3,074 |  | 1,061 |  | 2,013 |  | 23
Work equipment and other | 1,247 |  | 499 |  | 748 |  | 17
Total equipment | 14,052 |  | 5,345 |  | 8,707 |  | N/A
Technology and other | 1,390 |  | 611 |  | 779 |  | 12
Construction in progress | 1,230 |  | - |  | 1,230 |  | N/A
Total | $ | 84,558 |  | $ | 25,848 |  | $ | 58,710 |  | N/A
Millions, except estimated useful life As of December 31, 2024 | Cost | Accumulated depreciation | Net book value | Estimated useful life
Land | $ | 5,441 |  | N/A | $ | 5,441 |  | N/A
Road: |  |  |  |
Rail and other track material | 19,283 |  | $ | 7,642 |  | 11,641 |  | 46
Ties | 12,358 |  | 4,109 |  | 8,249 |  | 34
Ballast | 6,495 |  | 2,182 |  | 4,313 |  | 34
Other roadway [a] | 23,913 |  | 5,681 |  | 18,232 |  | 47
Total road | 62,049 |  | 19,614 |  | 42,435 |  | N/A
Equipment: |  |  |  |
Locomotives | 9,517 |  | 3,724 |  | 5,793 |  | 18
Freight cars | 3,011 |  | 1,037 |  | 1,974 |  | 22
Work equipment and other [b] | 1,222 |  | 482 |  | 740 |  | 17
Total equipment | 13,750 |  | 5,243 |  | 8,507 |  | N/A
Technology and other | 1,431 |  | 640 |  | 791 |  | 12
Construction in progress | 1,169 |  | - |  | 1,169 |  | N/A
Total | $ | 83,840 |  | $ | 25,497 |  | $ | 58,343 |  | N/A
[a]Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets. [b]For retirements of depreciable railroad properties that do not occur in the normal course of business, a gain or loss may be recognized if the retirement meets each of the following three conditions: (a) is unusual, (b) is material in amount, and (c) varies significantly from the retirement profile identified through our depreciation studies. In the second quarter of 2024, we sold a large portion of an intermodal equipment asset class resulting in a $46 million gain recognized in other expense in our Condensed Consolidated Statements of Income.

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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