SP 6008A,C-6010A,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 60011-6016 in 1949.
SP PA-1's - class DP-6 - ALCO-GE const. numbers 77097-77102:
| Original number | 1949 number | notes |
| SP 6008A | SP 6011 | |
| SP 6008C | SP 6012 | |
| SP 6009A | SP 6013 | |
| SP 6009C | SP 6014 | |
| SP 6010A | SP 6015 | |
| SP 6010C | SP 6016 |