Properties

6 Months Ended

Jun. 30, 2011

11. Properties

The following tables list the major categories of property and equipment, as well as the weighted average composite depreciation rate for each category:

Millions, Except Percentages				Accumulated		Net Book		Depreciation
As of June 30, 2011		Cost		Depreciation		Value		Rate for 2011
Land		$	5,008	$	N/A	$	5,008	N/A
Road:
Rail and other track material [a]			12,221		4,506		7,715	3.3%
Ties			7,814		1,944		5,870	2.9%
Ballast			4,081		969		3,112	3.0%
Other [b]			13,783		2,437		11,346	2.6%
Total road			37,899		9,856		28,043	2.9%
Equipment:
Locomotives			6,198		2,817		3,381	5.7%
Freight cars			1,926		1,059		867	3.5%
Work equipment and other			443		42		401	5.6%
Total equipment			8,567		3,918		4,649	5.2%
Technology and other			571		253		318	12.7%
Construction in progress			890		-		890	N/A
Total		$	52,935	$	14,027	$	38,908	N/A

[a]	Includes a weighted-average composite depreciation rate for rail in high-density traffic corridors.

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

Millions, Except Percentages				Accumulated		Net Book		Depreciation
As of December 31, 2010		Cost		Depreciation		Value		Rate for 2010
Land		$	4,984	$	N/A	$	4,984	N/A
Road:
Rail and other track material [a]			11,992		4,458		7,534	3.1%
Ties			7,631		1,858		5,773	2.8%
Ballast			4,011		944		3,067	3.0%
Other [b]			13,634		2,376		11,258	2.5%
Total road			37,268		9,636		27,632	2.8%
Equipment:
Locomotives			6,136		2,699		3,437	5.6%
Freight cars			1,886		1,040		846	3.6%
Work equipment and other			305		39		266	4.0%
Total equipment			8,327		3,778		4,549	5.1%
Technology and other			565		241		324	13.2%
Construction in progress			764		-		764	N/A
Total		$	51,908	$	13,655	$	38,253	N/A

[a]	Includes a weighted-average composite depreciation rate for rail in high-density traffic corridors.

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

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

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