v3.26.1
Investment in Master Trust - Schedule of Financial Information (Details) - EBP 004 - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
ASSETS    
Total Assets $ 1,674,508 $ 1,536,702
LIABILITIES    
Total Liabilities 280 489
Net Assets Available for Benefits at End of Year $ 1,674,228 $ 1,536,213
Plan’s Percentage of Investment in the Master Trust’s Net Assets 50.00% 49.00%
EBP, Nonconsolidated, Master Trust    
ASSETS    
Accrued income $ 319 $ 296
Due from brokers for securities sold 0 31
Investments, at fair value: 2,922,588 2,673,931
Stable Value Fund, at contract value: 309,923 331,455
Total Assets 3,232,830 3,005,713
LIABILITIES    
Due to brokers for securities purchased 0 26
Total Liabilities 0 26
Net Assets Available for Benefits at End of Year 3,232,830 3,005,687
EBP, Nonconsolidated, Master Trust | CSX Common Stock    
ASSETS    
Investments, at fair value: 884,518 852,648
EBP, Nonconsolidated, Master Trust | Mutual Funds    
ASSETS    
Investments, at fair value: 281,508 252,656
EBP, Nonconsolidated, Master Trust | Common Collective Trusts    
ASSETS    
Investments, at fair value: 1,355,365 1,191,312
EBP, Nonconsolidated, Master Trust | Other Common Stock    
ASSETS    
Investments, at fair value: 401,197 377,315
EBP, Nonconsolidated, Plan Interest in Master Trust    
ASSETS    
Accrued income 122 113
Due from brokers for securities sold 0 12
Investments, at fair value: 1,509,447 1,367,612
Stable Value Fund, at contract value: 111,573 119,323
Total Assets 1,621,142 1,487,060
LIABILITIES    
Due to brokers for securities purchased 0 8
Total Liabilities 0 8
Net Assets Available for Benefits at End of Year 1,621,142 1,487,052
EBP, Nonconsolidated, Plan Interest in Master Trust | CSX Common Stock    
ASSETS    
Investments, at fair value: 586,653 561,896
EBP, Nonconsolidated, Plan Interest in Master Trust | Mutual Funds    
ASSETS    
Investments, at fair value: 129,494 113,695
EBP, Nonconsolidated, Plan Interest in Master Trust | Common Collective Trusts    
ASSETS    
Investments, at fair value: 644,707 555,175
EBP, Nonconsolidated, Plan Interest in Master Trust | Other Common Stock    
ASSETS    
Investments, at fair value: $ 148,593 $ 136,846