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Properties | 3 Months Ended
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Mar. 31, 2025
Property, Plant and Equipment [Abstract] |
Properties | 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 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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