Tender on a Work/camp train?

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Veterans,

I noted a photo in Kenneth Miller's "Class J" of a work gang consist parked
on a siding that appeared to have a steam tender coupled to the rear of the
cars. The coal bunker end was close coupled to what might have been the
'diner'.
I don't have a page number, but it's a couple pages just prior to chapter
9, Disaster on the Tug Fork.
Would the tender have been used to supply coal and water for the cook?

Thanks,
Dave Willis
N&W Steam lives on in Indiana.