New cylinder saddle, photo...

[NW Mailing List]

Again, Impressive!

I think that, in Blue Peter's case, they needed only the cylinder/ 
valve block itself.  I THINK that plate-frame locos don't have what  
we call "cylinder saddles"; I think that the cylinders are bolted to  
the frame plates.  BP is a three cylinder loco, so I THINK that there  
are three separate cylinder castings with the frame plates sandwiched  
between the middle and the outside cylinder blocks.

pete groom
On Dec 14, 2007, at 7:20 PM, NW Mailing List wrote:

 From another forum....

http://www.austinsteamtrain.org/news.html#news1

http://www.austinsteamtrain.org/images/newspics/n-saddle.jpg

Nice peice of work!!

Andy Jennings
----- Original Message -----
From: NW Mailing List
To: NW Mailing List
Sent: Friday, December 14, 2007 5:13 PM
Subject: Re: wheel slippage

I'm impressed!

I've heard of fixing cracks in large castings by "stitch welding",  
whatever that is, but a cylinder casting is quite complex, with all  
the internal passages, etc., that are probably inaccessible.

pete groom
On Dec 13, 2007, at 9:43 PM, NW Mailing List wrote:

If you want to know how difficult a cylinder casting in the US today  
is, then ask the Austin Steam Train Assoc. They had a new one cast  
for the SP 786. A crack was found and the engine taken out of service  
around 2000. The Boiler is now at one shop and the frame/running gear  
at another. The current time line has the boiler and frame being  
finished and returned to Austin for completion of the rebuild in  
2008. Running gear, wheels and cylinders will all be practically new  
when she returns to service.

Jason Greene
Steele, AL




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