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Operating Assets and Facilities | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Operating Assets and Facilities | Operating Assets and Facilities The following table shows the components of our operating assets and facilities as of December 31 (in millions):
| 2024 |  | 2023
Railcars and locomotives | $ | 12,702.9 |  |  | $ | 11,700.8 |
Aircraft spare engines | 1,030.4 |  |  | 769.7 |
Tank containers | 241.4 |  |  | 237.7 |
Buildings, leasehold improvements, and other equipment | 265.3 |  |  | 253.0 |
Other | 90.6 |  |  | 120.7 |
| $ | 14,330.6 |  |  | $ | 13,081.9 |
Less: allowance for depreciation | (3,880.9) |  |  | (3,670.7) |
Net operating assets and facilities | $ | 10,449.7 |  |  | $ | 9,411.2 |
The following table shows the components of our total depreciation expense for the years ended December 31 (in millions):
| 2024 |  | 2023 |  | 2022
Operating assets and facilities, included in depreciation expense | $ | 402.4 |  |  | $ | 376.3 |  |  | $ | 357.5 |
Maintenance operating assets and facilities, included in maintenance expense | 11.8 |  |  | 9.3 |  |  | 7.5 |
Depreciation on operating assets and facilities | $ | 414.2 |  |  | $ | 385.6 |  |  | $ | 365.0 |
Non-operating assets, included in SG&A | 6.7 |  |  | 5.9 |  |  | 6.3 |
Total depreciation expense | $ | 420.9 |  |  | $ | 391.5 |  |  | $ | 371.3 |

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