Not great photos, but these are all I can find on short notice. There are two styles of harp switchstands in Rockhill Furnace -- one designed for three-way switches and the other for two-way. In practice, three-way stands were used for both two- and three-way switches. I'd have to make a trip up to Rockhill to offer an accurate count (and even then someone would probably need to correct me), but what I can think of off the top of my head is that Rockhill has one three-way switch with a three-way switch stand, two two-way switches with three-way stands, and maybe two two-way switches with two-way stands (one partly suspended over Jordan Creek on the paint-shop lead, because the creek's been cutting into its banks). The other switches have more modern mechanisms.
A two-way switch with a two-way switchstand by the coal tipple last month. Behind it is a three-way switch with a three-way switchstand.
No. 14 pulling up over the inspection pit by the boiler shop in 2003. You can't see the switch itself but it's two-way.