List of reporting marks: K
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.
K[]
- KABX - ,
- KACX - Kaiser Aluminum and Chemical Corporation
- KAIX - Rinker Materials Corporation
- KAMX -
- KARX -
- KBSR - Kankakee, Beaverville and Southern Railroad
- KBSZ - Kankakee, Beaverville and Southern Railroad
- KCCX - Kennecott Utah Copper Corporation
- KCDX - Eastman Kodak Company
- KCGX - ,
- KCIX - ,
- KCLX - Kansas City Power and Light Company
- KCMO - Kansas City, Mexico & Orient
- KCMX -
- KCNW -
- KCPX -
- KCRX -
- KCS - Kansas City Southern Railway
- KCSM - Kansas City Southern de Mexico
- KCSU - Kansas City Southern Railway
- KCSZ - Kansas City Southern Railway
- KCT - Kansas City Terminal Railway
- KCTV -
- KCWB -
- KCWX -
- KDCX -
- KDEX -
- KE -
- KEBX -
- KELX - Kellogg Company
- KENN - Kennecott Company Railroad
- KENX -
- KET -
- KEWH -
- KEYX -
- KFGX -
- KFMX -
- KFPX -
- KFR - Kettle Falls International Railway
- KFTX -
- KGCX - , INDSPEC Chemical Corporation
- KGFX -
- KGLX - Commonwealth Edison Company
- KGRX -
- KIIX -
- KJR - Kiski Junction Railroad
- KJRY - Keokuk Junction Railway
- KKLU - K Line
- KKLZ - K Line
- KKRR - Knox and Kane Railroad
- KKRX -
- KKTU - Kerr Steamship K Line
- KLCU -
- KLL - , ,
- KLSC - Kalamazoo, Lake Shore and Chicago Railway
- KLSX -
- KM -
- KMCU - Mitsui O.S.K. Lines, Ltd.
- KMCX -
- KMEU - K Line
- KMFX -
- KMTU -
- KMTX - Kinder Morgan, Inc.
- KMTZ -
- KMUX -
- KNC -
- KNDX - ,
- KNLU -
- KNOR - Klamath Northern Railway
- KNOX -
- KNWA - Kanawha River Railroad
- KO - Kansas and Oklahoma Railroad
- KOAX - a division of the Coca-Cola Company
- KOG - Kansas, Oklahoma and Gulf Railway; Missouri Pacific Railroad; Union Pacific Railroad
- KPCX - ,
- KPCZ -
- KPGX -
- KPLU - K Line
- KPLX - ,
- KPPX -
- KPR - Kelowna Pacific Railway, Ltd.
- KPRR - Kodak Park Railroad
- KPRX - Kauai Plantation Railway
- KPXX - Progress Rail Services Corporation
- KRDX -
- KRIX - GE Rail Services Corporation
- KRL -
- KRPX -
- KRR - Kiamichi Railroad
- KRSX - ()
- KRT -
- KSCU -
- KSCZ -
- KSMX -
- KSPX - K+S Potash Canada GP
- KSRY - Kosciusko and Southwestern Railway
- KSW - Kansas and Oklahoma Railroad
- KT -
- KTR - Kendallville Terminal Railway
- KTTX - Trailer Train Company, TTX Company
- KTX - ACF Industries, Inc.
- KUCX -
- KVR -
- KWCU -
- KWT -
- KWTR -
- KWUX - ,
- KXHR - Knoxville and Holston River Railroad
- KYLE - Kyle Railroad
- KYLU - NYK Line
- KYRX - Progress Rail Services Corporation
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- Lists of AAR reporting marks