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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment, Net |
Property and Equipment, Net | 9. Property and Equipment, Net Property and equipment, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2023 | ​ | 2022
Railroad and equipment | ​ | $ | 33,627 | ​ | $ | 33,627
Furniture and fixtures | ​ |  | 50,311 | ​ |  | 28,659
Machinery and equipment | ​ |  | 46,783 | ​ |  | 31,159
Office equipment | ​ |  | 7,692 | ​ |  | 5,518
Autos, trucks and aircraft | ​ |  | 7,108 | ​ |  | 7,033
​ | ​ |  | 145,521 | ​ |  | 105,996
Less: Accumulated depreciation | ​ |  | 80,423 | ​ |  | 67,133
​ | ​ |  | 65,098 | ​ |  | 38,863
Construction in progress | ​ |  | 951 | ​ |  | 775
Total property and equipment, net | ​ | $ | 66,049 | ​ | $ | 39,638
​ Depreciation expense on property and equipment was $15.7 million, $8.5 million and $6.1 million in 2023, 2022 and 2021, respectively.

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