Found this on a page titled "Don's Greyhound Bus Memories". His caption for this photo says that this is a picture of the Old North Coast Lines System's Chehalis, WA termial. He identifies the bus on the left as a 1931 Heiser scratch build, and the one on the left as a 1935 Kenworth with a Heiser body. The captions seem to back up the earlier identification of the bus in question, as well as the theory that they were predominately found in the Northwest