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There are many photos of WW&F flatcars loaded with logs. There is also that famous photo of a flatcar with a boiler on it in Wiscasset. The WW&F also used flatcars to carry coal to the blanket mill. I would imagine that such things as farming equipment would also have been shipped on flatcars. There is a photo around of a John Deere mowing machine on the platform at one of the stations.
While one of those looks like a tankcar, it really is a flatcar with a tank on it.