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RESTRUCTURING - Schedule of Restructuring Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | $ 8,000 | $ 17,000
Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 2,000 | 4,000
Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 6,000 | 13,000
Cost of goods sold | Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 1,000 | 2,000
Cost of goods sold | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 3,000 | 6,000
Selling, general and administrative expenses | Freight Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 1,000 | 2,000
Selling, general and administrative expenses | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | 3,000 | 5,000
Amortization expense | Transit Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Total Integration 2.0 restructuring charges | $ 0 | $ 2,000

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