Brass Question

[NW Modeling List]

Wally,
     Similar to the American multiple valve front end throttle, the 
Bradford Throttle moved the throttle valve that had previously been 
located in the steam dome, which was before the saturated steam entered 
the superheater, to a position at the front of the boiler where it was 
located after the superheater. Among other things, this should have made 
the locomotive quicker to respond to throttle openings by having 
superheated steam quickly available to move to the cylinders. Before, 
with the throttle valve located in the steam dome, when the throttle was 
closed, the superheater system was without steam and one had to wait for 
the pressure and superheated steam to build up between the steam dome 
and cylinders.

Jimmy Lisle

On 1/9/2025 9:40 AM, NW Modeling List via NW-Modeling-List wrote:
> Pardon my ignorance, Mr. Jimmy, but what does that do exactly. If you 
> don’t mind answering, I would appreciate it. I don’t know a lot about 
> steam engines, but I’ve never heard of that.
> Sent from my smart phone cuzz I’m just high tech like that, know what 
> I mean?
> WALLY
>
>> On Jan 9, 2025, at 05:41, NW Modeling List via NW-Modeling-List 
>> <nw-modeling-list at nwhs.org> wrote:
>>
>>  David, your model is missing a continuation of the throttle rod 
>> between the back of the sand dome and the equalizing lever on the 
>> boiler.
>>
>> The Y5s were to my knowledge the only Ys that used this particular 
>> throttle, so your supposition about the class of your model is 
>> correct. Not all Y5s used this throttle though. Later Ys (and As/Js) 
>> used an American front end throttle - it’s spotting feature is the 
>> large access plate behind the stack (and the throttle actuating lever 
>> just below it on the right side of the smokebox).
>>
>> Matt Goodman
>> Columbus, Ohio
>>
>> Sent from my mobile
>>
>> On Jan 8, 2025, at 10:38 PM, NW Modeling List 
>> <nw-modeling-list at nwhs.org> wrote:
>>
>> 
>> It is a Bradford Front End Throttle.
>>
>> Jimmy Lisle
>>
>>
>>
>> Sent from my Verizon, Samsung Galaxy smartphone
>>
>>
>> -------- Original message --------
>> From: NW Modeling List <nw-modeling-list at nwhs.org>
>> Date: 1/8/25 7:20 PM (GMT-05:00)
>> To: NW Modeling List <nw-modeling-list at nwhs.org>
>> Subject: Brass Question
>>
>> Hi society,
>> Does anyone know what this little thing in front of the smokestack 
>> is? This is supposedly a Y5.
>> David Baker
>> <1000005460.jpg>
>>
>>
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>
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