Properties (Tables)

12 Months Ended

Dec. 31, 2024

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	Cost		Accumulated Depreciation		Net Book Value		Estimated Useful Life
As of December 31, 2024
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 Consolidated Statements of Income.


Millions, Except Estimated Useful Life	Cost		Accumulated Depreciation		Net Book Value		Estimated Useful Life
As of December 31, 2023
Land	$	5,426	N/A		$	5,426	N/A
Road:
Rail and other track material	18,837		$	7,344	11,493		42
Ties	11,985		3,895		8,090		34
Ballast	6,345		2,061		4,284		34
Other roadway [a]	23,175		5,368		17,807		47
Total road	60,342		18,668		41,674		N/A
Equipment:
Locomotives	9,295		3,591		5,704		18
Freight cars	2,765		956		1,809		23
Work equipment and other	1,344		546		798		17
Total equipment	13,404		5,093		8,311		N/A
Technology and other	1,388		574		814		12
Construction in progress	1,173		-		1,173		N/A
Total	$	81,733	$	24,335	$	57,398	N/A

[a]Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.