Steam Engines and Tenders.

[Sumpter250]

I think that round tube above the drawbar is the stoker in the picture.

The mechanical stoker had either a single cylinder, or two cylinder steam "motor" (engine), usually mounted on the loco frame, left side, beneath the cab. What shows in the picture, is the end of the auger, that pulls the coal from the tender, up into the firebox.
One of the differences between the C&O 2-6-6-6, and the Virginian 2-6-6-6, is that the C&O versions had the stoker motor mounted in the tender, left side/front. There is an access door on the side of the C&O tenders.
On the page of the locomotive stoker company, the two tubes, Vee'd off the auger, lifted the coal on both sides of the firebox door. Some stokers only had a single "riser".