I have this unmouted set of10 steam engine wheels w/ a 1.737" tread diameter. Six of the wheels are loose and have 17 spokes.
The four blind wheels have 11 oval slotted disk centers mounted on axels with square keyed mounting blocks and 25+/- slightly angled teeth on both blind wheel axels. One pair of the driving wheels have a slotted crank pin, the other pair of geared driving wheels have a pressed in threaded steel insert. (Maybe due to missing crank pins??)
Any idea of the application?