Bunker C it is.
Many tender oil bunkers had two methods of heating the oil to
accomodate winter and summer temperatures. If a load of "cold" fuel
was put into the tender the DIRECT heating method was used. The
DIRECT method consisted of blowing live steam directly into the oil
to provide a rapid heating to allow it to flow to the burner.
INDIRECT heating used steam coils in the fuel bunker to provide the
heat necessary to keep the oil flowing. There are a couple of other
methods of heating but those mentioned were quite common on late
steam.
Forgetting to close the DIRECT heater often resulted in expanding the
oil to the point of overflow. A Fireman was not very popular with
the MM or the craft of people responsible for cleaning the congealed
mess from the deck and sides of the tender.
During photo run-by's, when the primary air damper was closed (like a
choke on a car), the firing valve wide open, throttle on the roof and
sand was being sucked through the tubes the cloud of smoke was
obvious to the fans. What was not quite as obvious to the fans was
the "ride from hell" in the cab. Bunker C, when "boiled", produces
an acrid, unbreathable cloud of smoke and, when it settles on skin
and clothing, remains on skin and clothing - - - FOREVER!!
Ahhh, the "good ol' days".
qrailroadman,
Karl
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