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Properties
 6 Months Ended
Jun. 30, 2014
Properties [Abstract]  
Properties [Text Block]

12. Properties

 

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  AccumulatedNet BookEstimated
As of June 30, 2014Cost DepreciationValueUseful Life
Land $ 5,134$N/A$ 5,134N/A
Road:       
Rail and other track material  14,219  5,105  9,114 33
Ties   8,968  2,396  6,572 33
Ballast   4,720  1,220  3,500 34
Other roadway [a]   15,996  2,796  13,200 47
Total road   43,903  11,517  32,386N/A
Equipment:       
Locomotives   7,882  3,625  4,257 20
Freight cars   2,073  969  1,104 25
Work equipment and other   571  135  436 18
Total equipment   10,526  4,729  5,797N/A
Technology and other   803  295  508 11
Construction in progress   1,076  -  1,076N/A
Total$ 61,442$ 16,541$ 44,901N/A
         

Millions, Except Estimated Useful Life  AccumulatedNet BookEstimated
As of December 31, 2013Cost DepreciationValueUseful Life
Land $ 5,120$N/A$ 5,120N/A
Road:       
Rail and other track material  13,861  4,970  8,891 35
Ties   8,785  2,310  6,475 33
Ballast   4,621  1,171  3,450 34
Other roadway [a]   15,596  2,726  12,870 48
Total road   42,863  11,177  31,686N/A
Equipment:       
Locomotives   7,518  3,481  4,037 20
Freight cars   2,085  1,000  1,085 25
Work equipment and other   561  119  442 18
Total equipment   10,164  4,600  5,564N/A
Technology and other   711  286  425 10
Construction in progress   954  -  954N/A
Total$ 59,812$ 16,063$ 43,749N/A
         
[a]Other roadway includes grading, bridges and tunnels, signals, buildings, and other road assets.