The American Rolling Mill Company Locos Page:
Welcome to the American Rolling Mill Company Locos Page. American Rolling Mill Company operated a fleet of locomotives to switch their plant or plants. As far as I know, they were not issued formal reporting marks for their locos since they seldom if ever left the confines of their plant. So, I will use (ARMCO) to denote their locos with the parentheses used to donote that these are unofficial initials used here for clarification only.
The company formally renamed itself ARMCO Steel in 1978. In 1989 ARMCO began a close association with Kawasaki Steel Corporation. They cemented that relationship in 1993 and renamed the combined company AK Steel Holdings.
Original orders:
| Orig. road numbers | model | Serial no. | build date | notes |
| (ARMCO) 701-702 | SW1500 | 72609-1 thru 72609-2 | 10/1972 | |
| (ARMCO) 703-704 | SW1500 | 73605-1 thru 73605-2 | 8/1973 | |
| (ARMCO) 705 | SW1500 | 73667-1 | 12/1973 | |
| (ARMCO) 706 | S12 | 76091 | 2/1955 | |
| (ARMCO) 1001 | DS-4-4-660 | 73041 | 10/1946 | |
| (ARMCO) 1151 | S8 | 75527 | 12/1951 | |
| (ARMCO) 1152 | S8 | 74998 | 10/1952 | |
| (ARMCO) 1201 | S8 | 75834 | 7/1952 | orig. (OLIRMC) 1216A; sold in 1/1954 |
| (ARMCO) B-84 | GP38-2 | 756065-1 | 9/1975 |