SP 5920-5921
These cabless booster units were built after the 1949 renumbering to eliminate alpha suffixes on SP locomotives, so were delivered in the SP 5900 series for passenger booster units.
SP PB-2's - class DP-9 - ALCO-GE const. numbers 78212-78213:
| Original number | notes | |
| SP 5920 | ||
| SP 5921 |