In the 20's there were a lot of agricultural products outbound, including the very profitable milk business with some finished mfg products.
The O&W was both busy and profitable in those years. In fact they weathered the traditional early depression years quite well not declaring bankruptcy until May 1937 after bituminous and antracite coal sales plummeted along with the milk business. The other thing that hit them hard was the amount of fixed debt. They were very mortgaged and when traffic levels and Railway Operating Income started to seriously decline they were in big trouble. Operations though were pretty busy including the very last day if you were simply a trackside observer and not a bean counter.
After WWII Oriskany Falls generated a substantial number of stone cars but it was largely for upgrading of highways downstate.
Most of the Northern Division was in-bound: lumber, coal, manufactured goods, autos, feed, fertilizer, molasses (for feed), asphalt, chemicals, metals, processed food products, etc. Coal, both anthracite and bituminous was big in CNY into the post WWII era and slacked off in the 50's and 60's and about extinct by rail (Erie Lackawanna) by 1970.
Fulton generated traffic like chocolate (Nestle) and other stuff but much of that traffic went right over to the NYC and down to Dewitt and out. Port of Oswego apparently had inbound newsprint and iron.
The DL&W did well when the O&W closed gaining customers from Norwich, Smyrna, Earlville, Solsville, Bouckville, Oriskany Falls, Hamilton and New Hartford via transload. For instance Bouckville Mills had a portable elevator at Waterville and Jacquay Feed from Hamilton had a transload at Hubbardsville until 1979. THE DL&W picked up the traffic but did not have to take but a few miles of track in the Utica / New Hartford area and a little (for a short time) in Norwich.