Originally Posted by Hot Water:
... That whole arrangement is part of the Worthington Feedwater pumping system. The very large diameter, insulation wrapped pipe that is right over the left cylinder/valve, is the heated water supply from the Worthington exhaust steam "heating tank"mounted in front of the stack, to the Worthington Boiler water Pump (which is steam driven, and controlled by the Fireman).
the Worthington SA system actually had two pumps. a cold water pump that would startup automatically when the water level in the smokebox tank was low...
and the hot water pump which, as was described, was under the control of the fireman.
both pictures of a 1:8 model NKP Berkshire.
cheers...gary