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Note 10 - Properties (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]

Millions, Except Estimated Useful Life

     

Accumulated

  

Net Book

  

Estimated

 

As of June 30, 2023

 

Cost

  

Depreciation

  

Value

  

Useful Life

 

Land

 $5,365  $N/A  $5,365   N/A 

Road:

                

Rail and other track material

  18,633   7,222   11,411   42 

Ties

  11,845   3,799   8,046   34 

Ballast

  6,285   2,004   4,281   34 

Other roadway [a]

  22,721   5,173   17,548   47 

Total road

  59,484   18,198   41,286   N/A 

Equipment:

                

Locomotives

  9,319   3,690   5,629   18 

Freight cars

  2,628   935   1,693   23 

Work equipment and other

  1,301   508   793   17 

Total equipment

  13,248   5,133   8,115   N/A 

Technology and other

  1,280   539   741   12 

Construction in progress

  1,134   -   1,134   N/A 

Total

 $80,511  $23,870  $56,641   N/A 

Millions, Except Estimated Useful Life

     

Accumulated

  

Net Book

  

Estimated

 

As of December 31, 2022

 

Cost

  

Depreciation

  

Value

  

Useful Life

 

Land

 $5,344  $N/A  $5,344   N/A 

Road:

                

Rail and other track material

  18,419   7,096   11,323   43 

Ties

  11,676   3,699   7,977   34 

Ballast

  6,222   1,950   4,272   34 

Other roadway [a]

  22,411   4,970   17,441   47 

Total road

  58,728   17,715   41,013   N/A 

Equipment:

                

Locomotives

  9,166   3,606   5,560   18 

Freight cars

  2,562   898   1,664   23 

Work equipment and other

  1,253   473   780   17 

Total equipment

  12,981   4,977   8,004   N/A 

Technology and other

  1,254   525   729   12 

Construction in progress

  948   -   948   N/A 

Total

 $79,255  $23,217  $56,038   N/A