EMD GP20:
This page is dedicated to EMD's fleet of GP20 units. EMD built a group of GP20 units in the early 1960s. They toured around the country and operated on a variety of railroads to attempt to generate orders for the model. The SP eventually purchased all four demonstrator units.
Original order:
| Orig. road numbers | model | EMD serial no. | build date | notes |
| EMDX 5625-5628 | GP20 | 26107-26110 | 8/1960 |
GP20: EMDX 5625 26107 8/1960 to SP 7234 SP 4084 to SP 4117 EMDX 5626 26108 8/1960 to SP 7235 SP 4085 EMDX 5627 26109 8/1960 to SP 7236 SP 4086 to SP 4105 EMDX 5628 26110 8/1960 to SP 7237 SP 4087