My 44 year old son is finally interested in model trains and has asked for the HO set I built for him when he was 5, about 1978.  He thought it was boring then so it's been tucked away since.  Fortunately, a Lionel HO engine and several cars are still in original boxes so easy to find info. about.  But I'm having trouble with identifying a second engine so I can tell him what he's getting, to match up with tracks & couplings, etc., since none of that stuff is simple anymore. 

The mystery engine is in a Bachmann HO box, the easy part, but the box has no labeling, just pictures of other engine models.  According to the engine's markings, it is a Santa Fe.  However, it does NOT match the image of a "307" on other sites.  It has a red front and silver rest of the body, with 4 OPEN holes near the center (1 in the red section) and a small (yellow cross) Santa Fe decal under 3 of the holes.  The"Santa Fe" is in SMALL block lettering at the lower back, near the rear and just above the red & yellow strips extending back from the red portion.  There is also a Santa Fe decal across the lower front of the engine, with 3 vertical yellow stripes extending up from the name decal and onto the top toward the window.   Thanks for any help or suggestions.  B