| 1 | AMPX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 2 | AMPX | General Electric Railcar Services Corp. | added 1/1984; 1/1985-1/1994; eliminated 1/2000 | | NAKINA |
| 3 | AMPX | North American Car Corp. | added 1/1977; 1/1980; eliminated 1/1984 | | NAKINA |
| 4 | AMPX | Ark-Mo Plant Food Co., Inc. | 1/1952-10/1957; eliminated 4/1958; added 7/1958; 4/1961-7/1965; eliminated 10/1965 | | NAKINA |
| 5 | AMPX | American Chemical Paint Co. | 7/1930-4/1938 | | NAKINA |
| 6 | AMPX | American Chemical Paint Co. | Apr-38 | | NRHS |
| 7 | AMPX | Ark-Mo Plant Food Co., Inc. | 1/52-10/57; added 7/58; 4/61-7/65; eliminated 10/65 | | NRHS |
| 8 | AMPX | North American Car Corp. | added 1/77; 1/80 | | NRHS |
| 9 | AMPX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 10 | AMPX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 11 | AMPX | *AMERICAN CHEMICAL PAINT CO. | | | PWRC |
| 12 | AMPX | *ARK-MO PLANT FOOD CO., INC. | | | PWRC |
| 13 | AMPX | +(NATX) G.E. RAIL SERVICES CORP. [NORTH AMERICAN CAR CORP.] (AMALGAMAIZE CO., LESSEE) | | | PWRC |
| 14 | AMPX | American Chemical Paint (GE Railcar Services Corporation) | | | RSRV |
| 15 | AMPX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |