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- List Of AAR Reporting Mark X Prefix
On Selasa, 23 April 2013
| XOMX | = | Exxon-Mobil Corporation |
| XCLX | = | Xcel Energy |
| XTRX | = | XTRA, Inc.; First Union Rail |
| XTTX | = | Trailer Train Company |
Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.