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Anyone have a clue what this device is?
It sits atop the smaller of two air tanks on the tender of #21.
From another photo, I'm reasonably certain that line [C] is connected to the large air tank to its immediate right, which feeds air through line [C] to pressurize the small tank. The large tank, btw, gets pressurized directly from the air pump on the locomotive. The pointed shadow [A] makes it look like is conical. [D] looks like it could be a union or the body of a globe valve, though I don't see a valve handle.
Any ideas what this device is and what purpose it serves?
It sits atop the smaller of two air tanks on the tender of #21.
From another photo, I'm reasonably certain that line [C] is connected to the large air tank to its immediate right, which feeds air through line [C] to pressurize the small tank. The large tank, btw, gets pressurized directly from the air pump on the locomotive. The pointed shadow [A] makes it look like is conical. [D] looks like it could be a union or the body of a globe valve, though I don't see a valve handle.
Any ideas what this device is and what purpose it serves?