I am fascinated by shortlines.... for lots of reasons. There are those who optimistically number their equipment with 3 and 4 digits and then there are those modest enough to start with 1.
The Davenport, Rock Island and Northwestern is one of those little lines. I caught this shot of Alco switcher #1 from a passing train while riding along the Mississippi River... and of course the sun was in exactly the wrong place.
who help resolve the identity of this engine since different internet sites have it differently tagged. It appears to be an S3.