With the extra diameter, maybe balancing would have been 'improved' sufficiently that, coupled with roller bearings throughout, speeds closer to 65-75 mph might have been intended/hoped for?
-Crandell
The Y7 has a much larger boiler and firebox than the Y5/Y6 classes. A Delta trailer truck has a relatively long side frame which gives it a characteristic appearance. When this idea was discarded, the rear of the locomotive frame was revised to accommodate a trailer truck that was similar to the lead truck. The boiler and the rest of the running gear remained the same.
The Y7 had 63" drivers, so it would have been a moderate speed locomotive. It was similar in size to the DRGW L-131 Class 2-8-8-2s although with higher pressure (275 or 300 psi).
The trailing wheel is further back than on the Y6b, where it was just behind the drivers, and the firebox appears larger. Designed for higher speeds?
feltonhill In Jeffries' original N&W Giant of Steam, the Y7 text and diagram are on pgs 275-277. In the revised Edition, they're on pgs 262-263. Diagram is the same. One caveat. The diagram in the book (and the detailed elevation I developed from it) features a Delta trailing truck. As the design progressed, this was changed to a trailing truck that was similar to the lead truck.
In Jeffries' original N&W Giant of Steam, the Y7 text and diagram are on pgs 275-277. In the revised Edition, they're on pgs 262-263. Diagram is the same. One caveat. The diagram in the book (and the detailed elevation I developed from it) features a Delta trailing truck. As the design progressed, this was changed to a trailing truck that was similar to the lead truck.
There you go Dave.
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"For heaven's sake"? Give us a friggin' break Overmod, not everyone's got Ed King's book.
And Feltonhill, I checked pages 275-277, sure enough, there it is. Looks like I didn't look as closely as I should have. "Mea culpa, mea maxima culpa...."
For heaven's sake, Ed King's book on the A has a discussion of this engine, including a number of relevant specs. Juniatha in a previous post noted that she had looked at some of the surviving drawings and had doubts about some of the detail design.
Voyce Glaze's book is one of the great treasures in the NWHS archives.
It might be noted, as I believe Ed noted, that there was nothing to keep the N&W from building a class of simple 2-8-8-2s after the ICC resolved the issue with permissible number of cars in trains. It's significant, I think, that this did not happen (but a considerable amount of work was put into making the Y-class compounds capable of more efficient operation).
I have both versions, and I thought it was in both. I'll check the "library" tomorrow AM. It's two floors down and I'm ready to call it quits for the day. Apparently there's no way to post photos directly on the forum, so I guess we're out of luck to see the drawing. I don't have any accounts in photobucket , flickr or other photo sharing site. Sometimes technology works for you, sometimes it doesn't.
Feltonhill, I suspect you've got the updated edition of the Jeffries book. Mine's the first edition from 1980. De-acessioned from the Library of Congress as a matter of fact. I got lucky.
Bud Jeffries' book contains information and a diagram of what the Y7 would have looked like based on available drawings. I developed a detailed elevation drawing based on that sketch about 10 years ago. I'll see if I can find the page numbers in the book (s). I have the original drawing, but don't know how to post the scan. Nothing seems to work to get the link posted here.
Okay, I found a link in a post on an older thread. Look at the drawings, and have fun!
http://www.nwhs.org/archivesdb/detail.php?ID=90311
I checked my copy of "Norfolk and Western, Giant of Steam" to see if I could find anything for you, but there's no mention of a Y7. I remember reading (somewhere) there was a Y7 proposed, but as diesels were coming into the picture nothing was ever done about it.
Sorry, but that's all I've got.
I believe that we discussed this recently, and the answer is yes. I think it was more of a higher speed design like the A, as opposed to the Y6. The original specifications still exist, and may not have yet been scanned. I'll look for the applicable posts.
I have heard that N&W had plans for a Y7 simple articulated, Is there and specs for this engine?
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