Railroad Transportation
| SIC8 | DESCRIPTION |
| 4011-0000 | RAILROADS LINE-HAUL OPERATING |
| 4011-9901 | ELECTRIC RAILROADS |
| 4011-9902 | INTERURBAN RAILWAYS |
| 4011-9903 | STEAM RAILROADS |
| 4013-0000 | SWITCHING AND TERMINAL SERVICES |
| 4013-9901 | BELT LINE RAILROADS |
| 4013-9902 | LOGGING RAILROADS |
| 4013-9903 | RAILROAD SWITCHING |
| 4013-9904 | RAILROAD TERMINALS |
