List of reporting marks: X

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