Here's a pair that are the subject of a couple of threads. They're the original "E" units (OK, they're the predecessors that led up to the E units). Hopefully we'll get the pair in O scale along with their siblings from other roads. Here they are pulling the Super Chief:
Here's a color photo:
While I like the look of the skirts over the truck side frames, from other photos it's obvious the maintenance crews didn't like them too much and removed them. They're double-ended box cabs, though they ran as a pair before one of the unit was "updated".