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Property and Equipment and Leases (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Line Items]  
Property and Equipment
Major classifications of property and equipment as of December 31, 2016 and 2015 were as follows (dollars in thousands):
 
 
2016
 
 
Gross Book Value
 
Accumulated Depreciation
 
Net Book Value
Property:
 
 
 
 
 
 
Land and land improvements
 
$
735,054

 
$
—

 
$
735,054

Buildings and leasehold improvements
 
214,980

 
(43,431
)
 
171,549

Bridges/tunnels/culverts
 
692,324

 
(103,521
)
 
588,803

Track property
 
2,639,961

 
(477,366
)
 
2,162,595

Total property
 
4,282,319

 
(624,318
)
 
3,658,001

Equipment:
 
 
 
 
 
 
Computer equipment
 
20,449

 
(14,927
)
 
5,522

Locomotives and railcars
 
893,911

 
(217,704
)
 
676,207

Vehicles and mobile equipment
 
72,388

 
(41,257
)
 
31,131

Signals and crossing equipment
 
72,210

 
(37,632
)
 
34,578

Track equipment
 
48,931

 
(15,663
)
 
33,268

Other equipment
 
57,547

 
(24,845
)
 
32,702

Total equipment
 
1,165,436

 
(352,028
)
 
813,408

Construction-in-process
 
31,910

 
—

 
31,910

Total property and equipment
 
$
5,479,665

 
$
(976,346
)
 
$
4,503,319

 
 
2015
 
 
Gross Book Value
 
Accumulated Depreciation
 
Net Book Value
Property:
 
 
 
 
 
 
Land and land improvements
 
$
648,498

 
$
—

 
$
648,498

Buildings and leasehold improvements
 
238,272

 
(32,624
)
 
205,648

Bridges/tunnels/culverts
 
662,287

 
(85,040
)
 
577,247

Track property
 
2,508,100

 
(403,778
)
 
2,104,322

Total property
 
4,057,157

 
(521,442
)
 
3,535,715

Equipment:
 
 
 
 
 
 
Computer equipment
 
18,633

 
(11,709
)
 
6,924

Locomotives and railcars
 
653,077

 
(173,214
)
 
479,863

Vehicles and mobile equipment
 
65,241

 
(34,656
)
 
30,585

Signals and crossing equipment
 
69,315

 
(30,754
)
 
38,561

Track equipment
 
28,440

 
(11,628
)
 
16,812

Other equipment
 
73,405

 
(13,846
)
 
59,559

Total equipment
 
908,111

 
(275,807
)
 
632,304

Construction-in-process
 
47,044

 
—

 
47,044

Total property and equipment
 
$
5,012,312

 
$
(797,249
)
 
$
4,215,063
Property and Equipment Useful Life
The Company depreciates its property and equipment using the straight-line method over the useful lives of the property and equipment. The following table sets forth the estimated useful lives of the Company's major classes of property and equipment: 
 
 
Estimated Useful Life (in Years)
 
 
Minimum
 
Maximum
Property:
 
 
 
 
Buildings and leasehold improvements (subject to term of lease)
 
2
 
40
Bridges/tunnels/culverts
 
20
 
50
Track property
 
3
 
50
 
 
Equipment:
 
 
 
 
Computer equipment
 
2
 
10
Locomotives and railcars
 
2
 
30
Vehicles and mobile equipment
 
2
 
15
Signals and crossing equipment
 
2
 
20
Track equipment
 
2
 
20
Other equipment
 
2
 
20
Railcars and Locomotives Leased
The number of railcars and locomotives leased by the Company as of December 31, 2016, 2015 and 2014 was as follows:
 
 
2016
 
2015
 
2014
Railcars
 
20,738

 
21,819

 
18,583

Locomotives
 
309

 
333

 
162
Schedule of Rent Expense
The Company's operating lease expense for equipment and real property leases and expense for the use of other railroad and other third parties' track for the years ended December 31, 2016, 2015 and 2014 was as follows (dollars in thousands):
 
 
2016
 
2015
 
2014
Equipment
 
$
91,537

 
$
91,919

 
$
32,433

Real property
 
$
14,291

 
$
12,136

 
$
8,670

Trackage rights
 
$
87,194

 
$
78,140

 
$
53,783
Schedule of Future Minimum Lease Payments for Capital Leases
The following is a summary of future minimum lease payments under capital leases and operating leases as of December 31, 2016 (dollars in thousands): 
 
 
Capital
 
Operating
 
Total
2017
 
$
17,438

 
$
84,266

 
$
101,704

2018
 
8,861

 
68,261

 
77,122

2019
 
8,388

 
51,618

 
60,006

2020
 
14,614

 
42,246

 
56,860

2021
 
6,677

 
33,100

 
39,777

Thereafter
 
30,417

 
266,358

 
296,775

Total minimum payments
 
$
86,395

 
$
545,849

 
$
632,244
Schedule of Future Minimum Lease Payments for Operating Leases
The following is a summary of future minimum lease payments under capital leases and operating leases as of December 31, 2016 (dollars in thousands): 
 
 
Capital
 
Operating
 
Total
2017
 
$
17,438

 
$
84,266

 
$
101,704

2018
 
8,861

 
68,261

 
77,122

2019
 
8,388

 
51,618

 
60,006

2020
 
14,614

 
42,246

 
56,860

2021
 
6,677

 
33,100

 
39,777

Thereafter
 
30,417

 
266,358

 
296,775

Total minimum payments
 
$
86,395

 
$
545,849

 
$
632,244
Construction in Progress [Member]  
Property, Plant and Equipment [Line Items]  
Property and Equipment
 
 
2016
 
2015
Property:
 
 
 
 
Buildings and leasehold improvements
 
$
85

 
$
2,097

Bridges/tunnels/culverts
 
1,600

 
39

Track property
 
12,302

 
24,962

Equipment:
 
 
 
 
Locomotives and railcars
 
11,786

 
12,875

Other equipment
 
6,137

 
7,071

Total construction-in-process
 
$
31,910

 
$
47,044