The Pony Engine and the Pacific Express

These whimsical illustrations accompanied William Dean Howells short story, "The Pony Engine and the Pacific Express."   This particular version of the children's story was published in Olive Beaupre Miller (Editor), Over the Hills of My Book House.  (Chicago:  The Book House for Children, 1920, 34th printing 1951.)  The illustrator signed some of them as "Ferring" but I can't find any information about him/her.