Class A front cylinders steam pipe question

[NW Mailing List]

Thanks Jimmy for posting those drawing numbers. The steam path to the valve chest beyond the slip joint is longer than I thought. The balance tube is an interesting detail as well. 

Matt Goodman
Columbus, Ohio

> On Sep 27, 2023, at 8:32 PM, NW Mailing List <nw-mailing-list at nwhs.org> wrote:
> 
> Mike,
>     It is called in drawing D33762 "Ball Joint Housing For Steam To Front Engine Class A". Steam enters this housing and is then directed to a manifold that routes the steam to the front cylinder, see drawing D34000. This manifold also connects to both cylinders. "Steam Beating"? No such a thing incoming, but, I will guess that just like a crossflow pipe between a cars two exhaust sides, that manifold would tend to equalize pressure between the front cylinders.
> <Steam Joint Class A.jpg>
> 
> On 9/27/2023 2:48 PM, NW Mailing List wrote:
>> What is the device at the end of the steam pipe and on top of the front cylinder called, and what is its purpose? 
>> Does it somehow "buffer" incoming steam "beating"? 
>> 
>> Did the A and the Y's differ in steam delivery? Am I correct in thinking the A's deliver steam using individual side pipes on the side/underneath of the boiler, and the Y's deliver steam through a single central pipe under the boiler?  What makes each option best fo the individual use case?  I'm guessing it has something to do with compound vs simple?
> 
>> The Y class "Live" steam delivery was also piped outside of the boiler, running back to the high pressure cylinder saddle only. Steam delivery to the Y front engine was through a central receiver pipe. To learn more about how the Y class worked go to this website: Mallet Articulated Locomotives (ALCO) - http://www.catskillarchive.com/rrextra/mallet.Html
> Jimmy Lisle
> 
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