A minor point and part of the OGR Continuing Education Program...
There are no dashes in EMD diesel model names. The engine here is a GP38, not a GP-38. The only place where EMD used dashes was in the "Dash 2" model line, as in SD40-2, GP38-2, etc.
If it says "GP-38" on the box, the box is wrong.
Here endeth the lesson.