SP 6005A,C-6007A,C
These units were built with alpha suffixes with associated B-units with corresponding B alpha suffix. They were initially operated in ABC sets, but were never drawbar-coupled. They were renumbered to SP 6005-6010 in 1949.
SP PA-1's - class DP-5 - ALCO-GE const. numbers 75783-75784, 76072-75075:
| Original number | 1949 number | notes |
| SP 6005A | SP 6005 | |
| SP 6005C | SP 6006 | |
| SP 6006A | SP 6007 | |
| SP 6006C | SP 6008 | |
| SP 6007A | SP 6009 | |
| SP 6007C | SP 6010 |