Class A sheathed smokebox.

[NW Mailing List]

If you're going to go down this sheathed/unsheathed smokebox rabbit hole,
you might as well go all the way down and throw in the airline cooling
radiators on the front engine.

I always thought they were only present on A's until I noticed a radiator
on a Y6a.  I also thought all A's got them, but this is not so, either! It
seems a quite few Y5's got them, which makes some sense as the Y5's ended
up doing yard switching would would have involved a lot of frequent
braking.

I have not noticed any Y6b's with the radiator.  I think I've heard it
called an "aftercooler"?

Here is Y6a 2167 (I've cleaned up the color, compared to the original scan)
https://www.nwhs.org/archivesdb/detail.php?ID=209169
[image: image.png]

Mike Rector


On Mon, Feb 6, 2023 at 12:12 PM NW Mailing List via NW-Mailing-List <
nw-mailing-list at nwhs.org> wrote:

> Ken,
>
> Okay, great! Sorry I was confused a bit. Thanks.
>
> Also, to others on the list, I’m fine with calling it lagging. Sheathing
> or jacketed are also words I’ve heard as descriptions.
>
>
>
> > Message: 5
> > Date: Mon, 6 Feb 2023 10:23:09 -0500
> > From: NW Mailing List <nw-mailing-list at nwhs.org>
> > To: NW Mailing List <nw-mailing-list at nwhs.org>
> > Subject: Re: Class A sheathed smokebox.
> > Message-ID: <mailman.3887.1675697177.1414322.nw-mailing-list at nwhs.org>
> > Content-Type: text/plain;     charset=us-ascii
> >
> > Chris
> >
> > That was to depict the difference between the two versions, which was
> the original question.
> >
> > Best
> > Ken Miller
> >
> >
> >> On Feb 6, 2023, at 9:20 AM, NW Mailing List via NW-Mailing-List <
> nw-mailing-list at nwhs.org> wrote:
> >>
> >> Hi Ken,
> >>
> >> The 1239 image shown in your post below does not look like it has a
> sheathed smokebox. Look at where the smokebox meets the boiler. The
> sheathing does not extend forward from the boiler over the smokebox.
> >>
> >> Chris
>
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