| 1 | NCX | UNIROYAL (1966) Ltd., Chemical Division | added 4/1967; 4/1970; eliminated 1/1972 | | NAKINA |
| 2 | NCX | Naugatuck Chemicals, Division of Dominion Rubber Co., Ltd. | 10/1966; eliminated 4/1967 | | NAKINA |
| 3 | NCX | Dominion Rubber Co., Ltd. | 1/1952 (not listed); 7/1954-7/1965 | | NAKINA |
| 4 | NCX | United States Rubber Co., care of Naugatuck Chemical Co. | 4/1947 | | NAKINA |
| 5 | NCX | United States Rubber Co., care of Naugatuck Rubber Co. | 1/1946 | | NAKINA |
| 6 | NCX | United States Rubber Co., care of Naugatuck Chemical Co. | 1/1941-1/1945 | | NAKINA |
| 7 | NCX | United States Rubber Products, Inc., care of Naugatuck Chemical Co. | 4/1938 | | NAKINA |
| 8 | NCX | The Naugatuck Chemical Co. | 7/1937 | | NAKINA |
| 9 | NCX | The Naugatuck Chemical Co. (United States Rubber Co.) | 7/1932-7/1935 | | NAKINA |
| 10 | NCX | The Naugatuck Chemical Co. | 7/1930 | | NAKINA |
| 11 | NCX | The Naugatuck Chemical Co. (United States Rubber Co.) | Apr-38 | | NRHS |
| 12 | NCX | Dominion Rubber Co., Ltd. | 1/52-7/65 | | NRHS |
| 13 | NCX | Naugatuck Chemicals, Division of Dominion Rubber Co., Ltd. | 10/66; eliminated 4/67 | | NRHS |
| 14 | NCX | UNIROYAL (1966) Ltd., Chemical Division | added 4/67; 4/70; eliminated 1/72 | | NRHS |
| 15 | NCX | UNIROYAL {DOMINION RUBBER; US RUBBER; NAUGATUCK CHEMICAL} | | | PWRC |
| 16 | NCXI | NORTH COUNTRY EXPRESS INC | | | SCAC3 |
| 17 | NCXL | NORTHCOAST EXPRESS LINE | | | SCAC3 |
| 18 | NCXL | NCT TRANSPORT & LOGISTICS | | | SCAC4 |
| 19 | NCXQ | NORTH CAMERON EXPRESS | | | SCAC3 |
| 20 | NCXU | NOR LINES NORWAY AS | | N | BIC |
| 21 | NCXU | NOR-CARGO LTD | | | SCAC4 |
| 22 | NCXX | NORTH COAST RAIL AUTHORITY | | | PWRC |
| 23 | NCXX | NORTH COAST RAIL AUTHORITY | | | SCAC4 |
