|
| 5150 | Railroad locomotive machinery and equipment parts, wholesale | |
| 3520 | Railroad locomotives and parts (except diesel engines), manufacturing | |
| 3694 | Railroad models, toy and hobby, manufacturing | |
| 7010 | Railroad property leasing | |
| 7010 | Railroad property, lessor of | |
| 3520 | Railroad rolling stock, manufacturing | |
| 3610 | Railroad seating, manufacturing | |
| 3520 | Railroad shops (part of a railroad or local transit network) | |
| 3190 | Railroad signaling equipment, manufacturing | |
| 6010 | Railroad switching services | |
| 6303 | Railroad terminals, independent operation | |
| 6304 | Railroad ticket offices | |
| 2010 | Railroad ties (i.e., bridge, cross, switch), wood, treating | |
| 0200 | Railroad ties, hewn | |
| 3520 | Railroad track equipment (e.g., rail layers, ballast distributors), manufacturing | |
| 2919 | Railroad track scales, manufacturing | |
| 4530 | Railroads signalling equipment, installation | |
| 6021 | Railroads, commuter operation | |
| 6021 | Railroads, scenic and sightseeing, local | |
| 2029 | Rails (except rough), wood fence, manufacturing | |
| 5142 | Rails (for railway), wholesale | |
| 5142 | Rails and accessories, metal, wholesale | |
| 0200 | Rails, fence, round or split | |
| 2710 | Rails, iron or steel, made in steel mills | |
| 2720 | Rails, made from purchased aluminum | |
| 2710 | Rails, rerolled or renewed in steel mills | |
| 2811 | Railway bridge sections, prefabricated metal, manufacturing | |
| 7111 | Railway car leasing (except financial) | |
| 4520 | Railway construction (track, roadbed, trestles, signals, interlockers) | |
| 6010 | Railway containerized transportation service | |
| 4520 | Railway lines, construction | |
| 4520 | Railway maintenance services (i.e., rights-of-way, structures) | |
| 3120 | Railway motor control equipment, manufacturing | |
| 3120 | Railway motors and control equipment, electric, manufacturing | |
| 4520 | Railway roadbed construction, general contractors | |
| 2893 | Railway rolling stock hardware, manufacturing | |
| 4520 | Railway shop, construction | |
| 4520 | Railway stations, construction | |
| 6010 | Railway transport, freight | |
| 6010 | Railway transportation, freight, short-haul | |
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