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Note 11 - Properties (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]

Millions, Except Estimated Useful Life

     

Accumulated

  

Net Book

  

Estimated

 

As of December 31, 2021

 

Cost

  

Depreciation

  

Value

  

Useful Life

 

Land

 $5,339  $N/A  $5,339   N/A 

Road:

                

Rail and other track material

  17,980   6,844   11,136   44 

Ties

  11,364   3,516   7,848   34 

Ballast

  6,070   1,852   4,218   34 

Other roadway [a]

  21,593   4,657   16,936   47 

Total road

  57,007   16,869   40,138   N/A 

Equipment:

                

Locomotives

  9,371   3,779   5,592   17 

Freight cars

  2,227   822   1,405   24 

Work equipment and other

  1,161   411   750   18 

Total equipment

  12,759   5,012   7,747   N/A 

Technology and other

  1,209   523   686   12 

Construction in progress

  961   -   961   N/A 

Total

 $77,275  $22,404  $54,871   N/A 

Millions, Except Estimated Useful Life

     

Accumulated

  

Net Book

  

Estimated

 

As of December 31, 2020

 

Cost

  

Depreciation

  

Value

  

Useful Life

 

Land

 $5,246  $N/A  $5,246   N/A 

Road:

                

Rail and other track material

  17,620   6,631   10,989   42 

Ties

  11,051   3,331   7,720   34 

Ballast

  5,926   1,753   4,173   34 

Other roadway [a]

  21,030   4,329   16,701   48 

Total road

  55,627   16,044   39,583   N/A 

Equipment:

                

Locomotives

  9,375   3,555   5,820   17 

Freight cars

  2,118   789   1,329   25 

Work equipment and other

  1,107   351   756   18 

Total equipment

  12,600   4,695   7,905   N/A 

Technology and other

  1,199   520   679   13 

Construction in progress

  748   -   748   N/A 

Total

 $75,420  $21,259  $54,161   N/A