Properties

3 Months Ended

Mar. 31, 2025

Property, Plant and Equipment [Abstract]

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.