Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Estimated lives of useful depreciable assets

The estimated depreciable lives of operating assets and facilities are as follows:



Railcars	30 — 38 years
Locomotives	10 — 20 years
Buildings	40 — 50 years
Leasehold improvements	5 — 15 years
Marine vessels	30 — 65 years
Other equipment	5 — 30 years

Net gain on disposition of assets

The following table presents the net gain on asset dispositions for the year ended (in millions) :



	2012			2011			2010
Disposition gains	$	42.7		$	40.4		$	23.8
Residual sharing income	22.6			5.2			7.6
Non-remarketing disposition gains	19.2			27.0			18.0
Asset impairments	(5.0		)	(6.8		)	(8.3		)
Net Gain on Asset Dispositions	$	79.5		$	65.8		$	41.1

- Definition

Tabular disclosure of the useful life and salvage value of 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.

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