These look at first glance incredibly similar to the Petaluma & Santa Rosa RR cars of 1904.
The Petaluna cars were Holmans, lighter with smaller columns between windows. Holman "copied" traditionally many features of midwestern carbuilders. But in fact the Petaluna cars are built prior to my big Cinci Car 61' combines. This big combines had some very close cousins at the Oneonta & Mohwak, only one window section shorter and with elliptic sahses. As you may doubt, the virtual carpenters and blacksmiths are already working on them ;-)