Attached are four views of former C&O steam locomotive tenders downgraded to MW service, which makes them "sort-of freight" cars.
From the photos Bill McClure shared a few weeks back, I gather that most C&O outfit trains included at least one tender. Possibly the size of the tender varied with the size of the train. They probably carried coal for heating and/or cooking stoves until this was switched to natural gas, and likely also carried water for showers. I'm not sure if the water was fit to drink; MW tank cars for this purpose on some roads were marked "potable water". I see no such markings here.
All four cars were located together in Gordonsville, Virginia, around 1985-1986. There was quite a bit of old MW equipment held here at that time for eventual scrapping.