Tom --
But I thought the FW heater heated the water
enough that it would not thermally shock the
boiler, but the injector puts cold water directly
into the boiler from the tender with no heating,
and that a steam locomotive crew should never use
the FW heater when the loco was standing still, as
(for some reason I cannot now remember) a FW heater
cannot work well when the locomotive is standing still,
and the injector is used when standing still.
That is what I learned from being part of "Project
2472" and listening to the old heads.

That green fireman probably had the injector on
for much too long.

Corrections from knowledgeable folks cheerfully welcomed!

Margaret