Property and Equipment, Net

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Line Items]

Property, Plant and Equipment Disclosure [Text Block]

Property and Equipment, Net

Property and equipment, net (in millions), and the corresponding ranges of estimated useful lives were as follows:

							2015
	December 31, 2015			December 31, 2014			Range of Estimated Useful Life
Land for transportation purposes	$	6,037		$	5,983		—
Track structure	21,200			19,562			15 – 50 years
Other roadway	24,767			23,026			7 – 100 years
Locomotives	7,794			6,621			7 – 35 years
Freight cars and other equipment	2,629			2,350			8 – 40 years
Computer hardware, software and other	897			522			6 – 9 years
Construction in progress	1,031			1,292			—
Total cost	64,355			59,356
Less accumulated depreciation and amortization	(4,845		)	(3,550		)
Property and equipment, net	$	59,510		$	55,806

The Consolidated Balance Sheets at December 31, 2015 and 2014, included $814 million, net of $362 million of amortization, and $854 million, net of $374 million of amortization, respectively, for property and equipment under capital leases, primarily for rolling stock.

The Company capitalized $34 million, $30 million and $29 million of interest for the years ended December 31, 2015, 2014 and 2013, respectively.