[modeleng] Re: boiler making
- From: "Jesse Livingston" <fernj1@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2006 18:42:45 -0600
Dave,
Thanks for the info on UK railway brakes. I installed a vacuum ejector on
my Mich-Cal Shay so I could operate the brakes on the MSLS riding cars.
They work the reverse of your full sized locomotives in that there is no
vacuum on the train line until it is desired to apply the brakes. I have
never used the ejector as I haven't pulled any of the club cars with vacuum
brakes, but I am ready if the occasion arises. The Shay has enough traction
to pretty well hold a sizeable line of cars in check, but then again, I
haven't tried it. BTW: Some of the steamers and "paraffin burning spam
cans" utilize a small electric vacuum pump with reservoir to apply the
brakes. Three of my locomotives have steam brakes on them of some type or
the other. The Shay has a steam cylinder on each truck while the American
and Filer and Stowell have steam "jam brakes" between the drivers. The jam
brakes will lock the locomotive wheels if not used carefully.
Naff all?
Jesse in Tennessee where it is/was sunny and warm (53° F) all day.
> The vacuum on steam locos is generated by a vacuum ejector(s). Most locos
> have 2 ejectors, a large to create vacuum quickly, i.e. if to much brake
> has
> been applied and vacuum is to low to allow release, and a small ejector to
> maintain the vacuum whilst running. The GWR had to be different and
> instead
> of a small ejector, they used a vacuum pump to maintain the vacuum whilst
> running, this was driven off the crosshead and is sometimes called a
> crosshead pump. These pumps are very useful if you are struggling for
> steam
> but they can be unreliable and not maintain the 25" required on a western
> engine to keep the brakes off, you have to keep using the large to create
> the full 25" of naff all.
> Diesels locos that were fitted with vacuum brakes had an exhauster driven
> from somewhere in the tin box, I don't know much about paraffin burning
> spam
> cans.
>
> Dave.
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