Real world company prefixes
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S& SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ
SE& SEA SEB SEC SED SEE SEF SEG SEH SEI SEJ SEK SEL SEM SEN SEO SEP SEQ SER SES SET SEU SEV SEW SEX SEY SEZ
SECD SECE SECG SECK SECN SECO SECR SECS SECT SECU SECV SECX SECY
S& SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ
SE& SEA SEB SEC SED SEE SEF SEG SEH SEI SEJ SEK SEL SEM SEN SEO SEP SEQ SER SES SET SEU SEV SEW SEX SEY SEZ
SECD SECE SECG SECK SECN SECO SECR SECS SECT SECU SECV SECX SECY
| 1 | SEC | 3D Aviation | ICAO1 | ||
| 2 | SECD | SEC SAWMILL EQUIPMENT COMPANY INC | SCAC4 | ||
| 3 | SECE | SEACOAST TRUCKING INC | SCAC4 | ||
| 4 | SECG | SILVER EAGLE COMPANY | SCAC1 | ||
| 5 | SECG | SILVER EAGLE CO | PWRC | ||
| 6 | SECG | SOUND FUEL LLC | SCAC4 | ||
| 7 | SECK | SECAS TRUCKING | SCAC4 | ||
| 8 | SECN | SEELEY AND ARNILL CONSTRUCTION | SCAC4 | ||
| 9 | SECO | SEWCO INC. | PWRC | ||
| 10 | SECO | SOUTHEAST COOPERATIVE SERVICE COMPA | SCAC4 | ||
| 11 | SECR | SCREAMIN EAGLE CARTAGE INC | SCAC4 | ||
| 12 | SECS | EUROTAINER S.A.R.L | SCAC3 | ||
| 13 | SECS | EUROTAINER S.A.R.L. | PWRC | ||
| 14 | SECT | SELECT TRANSPORTATION SERVICES DIVI | SCAC4 | ||
| 15 | SECU | EUROTAINER SA | SCAC4 | ||
| 16 | SECV | SUPERIOR TRANSPORT INC | SCAC4 | ||
| 17 | SECX | Southern Extract Co. (The Mead Corp.) | Apr-38 | NRHS | |
| 18 | SECX | *SOUTHERN EXTRACT CO. | PWRC | ||
| 19 | SECX | *(NATX) GENERAL ELECTRIC RAILCAR SERVICES CORP. [SOUTH EAST COAL CO.] | PWRC | ||
| 20 | SECX | Southern Extract Co. | 8/1920-4/1938 | NAKINA | |
| 21 | SECX | South-East Coal Co. | added 1/1975; 1/1975-1/1980; eliminated 7/1993; 1/1994 (not listed) | NAKINA | |
| 22 | SECX | General Electric Railcar Services Corp. | eliminated 1/2000 | NAKINA | |
| 23 | SECX | General Electric Rail Services Corp. | added 1/2000; 7/2000 (not listed); eliminated 10/2001 | NAKINA | |
| 24 | SECX | South-East Coal | RSRV | ||
| 25 | SECX | South-East Coal Co. | added 1/75; 1/75-1/80; eliminated 7/93; 1/94 | NRHS | |
| 26 | SECX | General Electric Railcar Services Corp. | eliminated 1/2000 | NRHS | |
| 27 | SECX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | NRHS | |
| 28 | SECY | STEWART TRUCKING | SCAC4 |