Thanks Mike for your ideas, and welcome back!
I didn't describe the red I saw on the bird's breast very well - it was a small collar, just below the throat, and seemed quite bright, not reddish brown. The only alternative to that being the bird's color would be if the sunlight (which was getting reddish) reflected on a white or light colored breast. I did see the bird from the back and recall it being sort of darkish (though again, the light was poor), which doesn't seem to correspond with a Bullfinch back I suppose. I didn't think it was as big as a thrush - from the back and maybe a little view of the beak, I thought it was a finch type.