| 1 | OVO | Ottawa Valley Railway | | | RSRV |
| 2 | OVOC | OVEROCEANS INC | | | SCAC4 |
| 3 | OVOM | OVO MOVING & STORAGE INC | | | SCAC4 |
| 4 | OVOX | Grace & Co. (Pacific Coast) | added 1/1954; 7/1954; eliminated 1/1957 | | NAKINA |
| 5 | OVOX | W.R. Grace & Co. | 7/1935-1/1952; eliminated 1/1954 | | NAKINA |
| 6 | OVOX | Oriental Vegetable Oils Co., U.S.A. (W.R. Grace & Co.) | 7/1930-7/1935 | | NAKINA |
| 7 | OVOX | Oriental Vegetable Oils Co., U.S.A. (W.R. Grace & Co.) | Apr-38 | | NRHS |
| 8 | OVOX | W.R. Grace & Co. | Jan-52 | | NRHS |
| 9 | OVOX | GRACE & CO. [W.R. GRACE & CO.; ORIENTAL VEGETABLE OILS CO.] | | | PWRC |
