Hullo guys, new to this forum. May be a bit of a silly question, but I've been looking at some 1920s NYC locomotives and have become stumped about something. On some locomotives including the L-2a and the H-10b, there is what looks to be a low slung box-shaped object just behind the chimney. From every picture I've looked at, I didn't see any pipes connecting it that would have anything to do with the feedwater system or the air brake system. It is also clearly not a dome of any sort. It seems to be fairly unique to these classes too. What exactly is the purpose of this box? Thanks.
Suspect that what you see is a version of the 'hatch' accessing the superheater header and associated front-end throttle. IIRC, it's like a saddle with a row of bolts around the periphery, with a gasketed plate bolted down on top
See if you can find a clear picture of the top of the original Woodard 8000 with the outside dry-pipe arrangement. That might have had a raised manifold arrangement bolting to a saddle like this, replaced by a flat plate when the arrangement was revised to inside pipe.
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