| 5201 | NRGI | NORRIS GRAIN & TRANSPORTATION INC | | | SCAC3 |
| 5202 | NRGU | RIGTRANS INTERMODAL LIMITED | | GB | BIC |
| 5203 | NRGX | NRG Energy, Inc. | added 4/2007 | | NAKINA |
| 5204 | NRGX | NRG ENERGY, INC. | | | PWRC |
| 5205 | NRGX | NRG ENERGY INC | | | SCAC4 |
| 5206 | NRHA | NORTH, HAROLD TRUCKING LTD | | | SCAC4 |
| 5207 | NRHC | NORTH CARRIAGE TRANSPORT | | | SCAC4 |
| 5208 | NRHE | NORTHEAST TRANSPORT | | | SCAC3 |
| 5209 | NRHL | NORMS HAULING LTD | | | SCAC3 |
| 5210 | NRHL | NORTHAM | | | SCAC4 |
| 5211 | NRHN | NORTHERN HOMES INC | | | SCAC3 |
| 5212 | NRHR | NORTHRIDGE EXPRESS INC | | | SCAC4 |
| 5213 | NRHS | BALTIMORE CHAPTER-NRHS INC | | | PWRC |
| 5214 | NRHS | NORTHEASTERN SOLUTIONS CORP | | | SCAC4 |
| 5215 | NRHV | NIGHELLI, RC HEATING SERVICES LLC | | | SCAC4 |
| 5216 | NRHX | National Railway Historical Society (passenger cars) | 1/1994-7/2005 (not listed) | | NAKINA |
| 5217 | NRHX | National Railway Historical Society (passenger cars) | 1/94-7/2000 | | NRHS |
| 5218 | NRHX | NATIONAL RAILWAY HISTORICAL SOCIETY - PASSENGER CARS | | | PWRC |
| 5219 | NRHX | National Railway Historical Society | | | RSRV |
| 5220 | NRHX | NATIONAL RAILWAY HISTORICAL SOCIETY | | | SCAC4 |
| 5221 | NRI | Nebkota Ry., Inc. | added 10/1994; 7/2000 | | NAKINA |
| 5222 | NRI | Nebkota Ry., Inc. | added 10/94; 7/2000 | | NRHS |
| 5223 | NRI | NEBKOTA RAILWAY, INC. | | | PWRC |
| 5224 | NRI | Nebkota Railway | | | RSRV |
| 5225 | NRI | NEBKOTA RAILWAY INC | | | SCAC4 |
| 5226 | NRI | Nebkota Railway Inc. | | USA | TRAFFIC |
| 5227 | NRIC | National railway infrastructure company / Национална компания \"Железопътна инфраструктура\" | | BG | VKM |
| 5228 | NRIL | NORTHERN INTERNATIONAL | | | SCAC3 |
| 5229 | NRIL | Network Rail | | UK | VKM |
| 5230 | NRIN | NANCO RELOCATIONS INC | | | SCAC3 |
| 5231 | NRIN | NORAM INTERIORS LTD | | | SCAC4 |
| 5232 | NRIQ | NSM RECYCLING INC | | | SCAC4 |
| 5233 | NRIS | NORIS SHIPPING SERVICE | | | SCAC3 |
| 5234 | NRIU | NATIONAL REFRIGERANTS INC. | | USA | BIC |
| 5235 | NRIU | National Refrigerants | | | RSRV |
| 5236 | NRIU | NATIONAL REFRIGERANTS, INC. | | | SCAC3 |
| 5237 | NRIU | NATIONAL REFRIGERANTS INC | | | SCAC4 |
| 5238 | NRIX | National Refrigerants, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 5239 | NRIX | National Refrigerants, Inc. | Jul-00 | | NRHS |
| 5240 | NRIX | NATIONAL REFRIGERANTS INCORPORATED | | | PWRC |
| 5241 | NRIX | National Refrigerants | | | RSRV |
| 5242 | NRIX | NATIONAL REFRIGERANTS, INC. | | | SCAC4 |
| 5243 | NRJ | Nakskov - Rødby Jernbane | 1926 - 1954 | DK | jernbanen.dk |
| 5244 | NRJ | Nakskov - Rødby Jernbane | 1926 - 1954 | DK | TRAFFIC |
| 5245 | NRK | Naturelink Charter (PTY) Ltd. | Callsign: Naturelink, | ZA | AVCODES |
| 5246 | NRK | Naturelink Charter | | | ICAO1 |
| 5247 | NRKB | NARK BROS | | | SCAC3 |
| 5248 | NRKI | NR TRUCKING INC | | | SCAC4 |
| 5249 | NRKQ | NORKUS TRUCKING | | | SCAC3 |
| 5250 | NRKT | NICKELL, RICK TRUCKING INC | | | SCAC4 |
| 5251 | NRL | Les Investissements Nolinor Inc. t/a Nolinor Aviation | IATA: N5, Callsign: Nolinor, Founded in 1992. | CDN | AVCODES |
| 5252 | NRL | Nolinor Aviation | | | ICAO1 |
| 5253 | NRLB | NAPPI R L BULK TRANSPORT INC | | | SCAC3 |
| 5254 | NRLI | NORTHLAND TRANSPORTATION INC | | | SCAC3 |
| 5255 | NRLK | NORFOLK CONTRACT CARRIERS INC | | | SCAC3 |
| 5256 | NRLK | NORLOK TECHNOLOGY INC | | | SCAC4 |
| 5257 | NRLL | NORSUL LINE | | | SCAC3 |
| 5258 | NRLL | NORSUL LINE | | | SCAC4 |
| 5259 | NRLT | NORTHLAND TRANSPORTATION INC | | | SCAC3 |
| 5260 | NRLX | The CIT Group/Capital Finance, Inc. | added 4/2007 | | NAKINA |
| 5261 | NRLX | Bombardier Capital Rail, Inc. | added 10/1999; 7/2000-7/2005; eliminated 4/2007 | | NAKINA |
| 5262 | NRLX | NorRail, Inc. | 1/1994 (not listed); added 1/1995; eliminated 10/1999 | | NAKINA |
| 5263 | NRLX | NorRail, Inc. | 1/94; added 1/95; eliminated 10/99 | | NRHS |
| 5264 | NRLX | Bombardier Capital Rail, Inc. | added 10/99; 7/2000 | | NRHS |
| 5265 | NRLX | *NICHOLS ROCK LINE RAILROAD | | | PWRC |
| 5266 | NRLX | +THE CIT GROUP/CAPITAL FINANCE INC. [BOMBARDIER CAPITAL RAIL; NORRAIL, INC.] | | | PWRC |
| 5267 | NRLX | NorRail | | | RSRV |
| 5268 | NRLX | BOMBARDIER CAPITAL RAIL INC | | | SCAC4 |
| 5269 | NRLX | Bombardier Capital Rail Incorporated | | USA | TRAFFIC |
| 5270 | NRM | NATIONAL RAILWAYS OF MEXICO (FERROCARRILES NACIONALES DE MEXICO) | | | PWRC |
| 5271 | NRMA | NORMANDIN TRANSIT INC | | | SCAC4 |
| 5272 | NRMC | NORMAC INC | | | SCAC3 |
| 5273 | NRML | NORTON RAMSEY MOTOR LINES INC | | | SCAC3 |
| 5274 | NRML | NORTH ARM TRANSPORTATION LTD | | | SCAC4 |
| 5275 | NRMO | NORAMCO TRANSPORT CORP | | | SCAC4 |
| 5276 | NRMQ | NORMS DELIVERY SERVICE | | | SCAC3 |
| 5277 | NRMT | NRM TRUCKING CO | | | SCAC3 |
| 5278 | NRMT | NORMAN TRANSPORT INC | | | SCAC4 |
| 5279 | NRMX | Merchants Despatch Transportation Corp. | added 7/1962; eliminated 10/1962 | | NAKINA |
| 5280 | NRMX | Northern Refrigerator Line, Inc. | added 1/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 5281 | NRMX | National Roofing Manufacturing Co. | 7/1937 (not listed) | | NAKINA |
| 5282 | NRMX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 5283 | NRMX | *NATIONAL ROOFING MANUFACTURING CO. | | | PWRC |
| 5284 | NRMX | *NORTHERN REFRIGERATOR LINE INC. | | | PWRC |
| 5285 | NRMX | +NATIONAL RAILROAD MUSEUM, INC. | | | PWRC |
| 5286 | NRMX | NATIONAL RAILROAD MUSEUM INC | | | SCAC4 |
| 5287 | NRN | Royal Netherlands Navy (Koninklijke Marine) | Callsign: Netherlands Navy, | NL | AVCODES |
| 5288 | NRN | Royal Netherland Navy | | | ICAO1 |
| 5289 | NRNI | NORTON INC | | | SCAC3 |
| 5290 | NRNK | NORTANK CARRIERS A S | | | SCAC3 |
| 5291 | NRNM | NEWFOUNDLAND RESOURCES & MINING | | | SCAC3 |
| 5292 | NRNS | NORMAN & SON INC | | | SCAC3 |
| 5293 | NRNX | Keith Railway Equipment Co. | 1/1952 | | NAKINA |
| 5294 | NRNX | Northwestern Refining Co. | 1/1950 | | NAKINA |
| 5295 | NRNX | Keith Railway Equipment Co. | Jan-52 | | NRHS |
| 5296 | NRNX | *NORTHWESTERN REFINING CO. | | | PWRC |
| 5297 | NRNX | *KEITH RAILWAY EQUIPMENT CO. | | | PWRC |
| 5298 | NRNY | NORTHERN RAILROAD OF NEW YORK | | | PWRC |
| 5299 | NRNY | Northern Railroad (New York) | | | RSRV |
| 5300 | NRO | Aero Rent, Joint-Stock Company | Callsign: Aeromaster, | RUS | AVCODES |
