EMD GP40X:
This page is dedicated to EMD's single GP40X unit. This unit was built as a test-bed for the upcoming GP40 line of locomotives. It was built on a GP35-length frame, featured flared radiators and a 645-series prime mover. It was eventually sold to the IC.
Other than the name and flared radiators, it featured little in common with the later locomotives of the same name which were basically test-beds for the upcoming GP50 line of locomotives.
Original order:
| Orig. road numbers | model | EMD serial no. | build date | notes |
| EMDX 433A | GP40X | 29877 | 5/1965 |
GP40X: EMDX 433A 29877 5/1965 to IC 3075 to ICG 2550