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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Property and equipment useful life
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
 
5
 
50
 
 
Equipment:
 
 
 
 
Computer equipment
 
2
 
10
Locomotives and railcars
 
2
 
30
Vehicles and mobile equipment
 
2
 
10
Signals and crossing equipment
 
4
 
30
Track equipment
 
2
 
20
Other equipment
 
2
 
20