List of reporting marks: X
# List of reporting marks: X

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.

## X

* XCLX - Xcel Energy
* XCWZ - Union Pacific Railroad
* XFEZ - Florida East Coast Railway
* XNWZ - Norfolk Southern Railway
* XOMX - Exxon-Mobil Corporation
* XRFZ - CSX Transportation
* XSCZ - CSX Transportation
* XSLZ - Soo Line Railroad
* XTRX - XTRA, Inc.; First Union Rail
* XTTX - Trailer Train Company
