SP H-12-44 page
The SP 45 FM H-12-44 switch engines over several orders from 1952-1957.
The SP purchased H-12-44's new as follows:
| Orig. road numbers | FM const. no. | build date |
| SP 1486-1491 | 12-L-653 thru 12-L-658 | 9-10/1952 |
| SP 1529-1535 | 12-L-760 thru 12-L-766 | 5/1953 |
| SP 1536-1538 | 12-L-771 thru 12-L-773 | 8/1953 |
| SP 1568-1571 | 12-L-833 thru 12-L-836 | 1/1956 |
| SP 1572-1576 | 12-L-976 thru 12-L-980 | 1-2/1956 |
| SP 1577-1586 | 12-L-1062 thru 12-L-1071 | 10-11/1956 |
| SP 1587-1596 | 12-L-1072 thru 12-L-1081 | 1-2/1957 |