Real world company prefixes

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M n O P Q R S T U V W X Y Z Ø
O& O2 O3 O4 O5 O6 O7 O8 O9 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OO OP OQ OR OS OT OU OV OW OX OY OZ
OKA OKB OKC OKD OKE OKF OKG OKI OKJ OKK OKL OKM OKN OKO OKP OKR OKS OKT OKW OKX OKY
OKKT
1 OKKT Union Pacific R.R. Co. added 4/1997; 7/2000-7/2005   NAKINA
2 OKKT Missouri Pacific System added 1/1990; 1/1994; eliminated 4/1997   NAKINA
3 OKKT Oklahoma, Kansas and Texas R.R. Co. added 10/1980; added 1/1981; eliminated 4/1982; added 1/1983; eliminated 1/1990   NAKINA
4 OKKT Oklahoma, Kansas and Texas R.R. Co. added 10/80; added 1/81; eliminated 4/82; added 1/83; eliminated 1/90   NRHS
5 OKKT Missouri Pacific System added 1/90; 1/94; eliminated 4/97   NRHS
6 OKKT Union Pacific R.R. Co. added 4/97; 7/2000   NRHS
7 OKKT UP [MISSOURI PACIFIC] [OKLAHOMA KANSAS & TEXAS RR.]     PWRC
8 OKKT Oklahoma, Kansas and Texas Railroad (Union Pacific Railroad)     RSRV