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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, NET PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, net is summarized as follows:
December 31,
20212020
Land, site improvements and rights$149,914 $52,047 
Construction in progress154,859 425,261 
Bridges and Tunnels174,889 — 
Buildings and improvements19,164 4,491 
Terminal machinery and equipment962,552 557,788 
Track and track related assets100,014 2,349 
Railroad equipment8,331 5,560 
Railcars and locomotives111,574 — 
Computer hardware and software5,335 5,101 
Furniture and fixtures3,119 2,449 
Other10,548 5,870 
1,700,299 1,060,916 
Less: Accumulated depreciation(144,442)(96,553)
Property, plant and equipment, net$1,555,857 $964,363 

We added property, plant and equipment of $639.4 million and $258.9 million during the years ended December 31, 2021 and 2020, respectively, which primarily consist of assets acquired in our acquisition of Transtar and terminal machinery and equipment placed in service or under development at Jefferson Terminal and Repauno.
Depreciation expense for property, plant and equipment is summarized as follows:
Year Ended December 31,
202120202019
Depreciation expense for property, plant and equipment:
Continuing operations$47,915 $26,581 $28,466 
Discontinued operations— — 2,187 
Total$47,915 $26,581 $30,653