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Note 11 - Properties (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]

Millions, Except Estimated Useful Life

     

Accumulated

  

Net Book

  

Estimated

 

As of December 31, 2023

 

Cost

  

Depreciation

  

Value

  

Useful Life

 

Land

 $5,426  $N/A  $5,426   N/A 

Road:

                

Rail and other track material

  18,837   7,344   11,493   42 

Ties

  11,985   3,895   8,090   34 

Ballast

  6,345   2,061   4,284   34 

Other roadway [a]

  23,175   5,368   17,807   47 

Total road

  60,342   18,668   41,674   N/A 

Equipment:

                

Locomotives

  9,295   3,591   5,704   18 

Freight cars

  2,765   956   1,809   23 

Work equipment and other

  1,344   546   798   17 

Total equipment

  13,404   5,093   8,311   N/A 

Technology and other

  1,388   574   814   12 

Construction in progress

  1,173   -   1,173   N/A 

Total

 $81,733  $24,335  $57,398   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