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Properties (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Net Properties
A detail of the Company’s net properties are as follows:
(Dollars in Millions)
 
 
 
Accumulated
 
Net Book
 
Annual Depreciation
 
Estimated Useful Life
 
Depreciation
December 2018
 
Cost
 
Depreciation
 
Value
 
Rate
 
( Avg. Years)
 
Method (a)
Road
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Rail and Other Track Material
 
$
7,964

 
$
(1,698
)
 
$
6,266

 
2.5%
 
40
 
Group Life
 
 
Ties
 
5,860

 
(1,557
)
 
4,303

 
3.7%
 
27
 
Group Life
 
 
Grading
 
2,757

 
(572
)
 
2,185

 
1.4%
 
72
 
Group Life
 
 
Ballast
 
3,076

 
(971
)
 
2,105

 
2.7%
 
37
 
Group Life
 
 
Bridges, Trestles, and Culverts
 
2,506

 
(382
)
 
2,124

 
1.6%
 
61
 
Group Life
 
 
Signals and Interlockers
 
2,975

 
(693
)
 
2,282

 
4.0%
 
25
 
Group Life/ Straight Line
 
 
Buildings
 
1,318

 
(486
)
 
832

 
2.5%
 
40
 
Group Life
 
 
Other
 
4,955

 
(1,964
)
 
2,991

 
4.2%
 
24
 
Group Life
Total Road
 
31,411

 
(8,323
)
 
23,088

 
 
 
 
 
 
Equipment
 
 

 
 
 
 
 
 
 
 
 
 
 
 
Locomotive
 
5,661

 
(2,266
)
 
3,395

 
3.5%
 
29
 
Group Life
 
 
Freight Cars
 
3,093

 
(882
)
 
2,211

 
2.9%
 
35
 
Group Life
 
 
Work Equipment and Other
 
2,338

 
(1,336
)
 
1,002

 
7.4%
 
14
 
Group Life/ Straight Line
Total Equipment
 
11,092

 
(4,484
)
 
6,608

 
 
 
 
 
 
Land
 
 
 
1,845

 
—

 
1,845

 
N/A
 
N/A
 
N/A
Construction In Progress
 
457

 
—

 
457

 
N/A
 
N/A
 
N/A
Total Properties
 
$
44,805

 
$
(12,807
)
 
$
31,998

 
 
 
 
 
 

(a) For depreciation method, certain asset categories contain intermodal terminals or technology-related assets, which are depreciated using the straight-line method.
NOTE 6.  Properties, continued

(Dollars in Millions)
 
 
 
Accumulated
 
Net Book
 
Annual Depreciation
 
Estimated Useful Life
 
Depreciation
December 2017
 
Cost
 
Depreciation
 
Value
 
Rate
 
(Avg. Years)
 
Method (a)
Road
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Rail and Other Track Material
 
$
7,694

 
$
(1,606
)
 
$
6,088

 
2.5%
 
40
 
Group Life
 
 
Ties
 
5,665

 
(1,446
)
 
4,219

 
3.7%
 
27
 
Group Life
 
 
Grading
 
2,662

 
(542
)
 
2,120

 
1.4%
 
72
 
Group Life
 
 
Ballast
 
2,994

 
(921
)
 
2,073

 
2.7%
 
37
 
Group Life
 
 
Bridges, Trestles, and Culverts
 
2,405

 
(356
)
 
2,049

 
1.6%
 
61
 
Group Life
 
 
Signals and Interlockers
 
2,759

 
(588
)
 
2,171

 
4.0%
 
25
 
Group Life/ Straight Line
 
 
Buildings
 
1,278

 
(464
)
 
814

 
2.5%
 
40
 
Group Life
 
 
Other
 
4,634

 
(1,867
)
 
2,767

 
4.2%
 
24
 
Group Life
Total Road
 
30,091

 
(7,790
)
 
22,301

 
 
 
 
 
 
Equipment
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Locomotive
 
6,083

 
(2,490
)
 
3,593

 
3.5%
 
29
 
Group Life
 
 
Freight Cars
 
3,262

 
(998
)
 
2,264

 
2.9%
 
35
 
Group Life
 
 
Work Equipment and Other
 
2,261

 
(1,282
)
 
979

 
7.4%
 
14
 
Group Life/ Straight Line
Total Equipment
 
11,606

 
(4,770
)
 
6,836

 
 
 
 
 
 
Land
 
 
 
1,849

 
—

 
1,849

 
N/A
 
N/A
 
N/A
Construction In Progress
 
778

 
—

 
778

 
N/A
 
N/A
 
N/A
Total Properties
 
$
44,324

 
$
(12,560
)
 
$
31,764

 
 
 
 
 
 
(a) For depreciation method, certain asset categories contain intermodal terminals or technology-related assets, which are depreciated using the straight-line method.