Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

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davidqueener
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Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by davidqueener » Sat Jul 13, 2019 12:35 pm

Gentlemen,

I am about to do a production run of 1/20th scale 24" and 26" wheelsets for Fn3 and I am looking for prototype drawings of 3' narrow gauge trucks, specifically, ones that used cast steel side frames. For instance, the C&S had a narrow gauge Bettendorf T-section truck, whereas the D&RGW had a narrow gauge Betttendorf U-section truck along with a variety of Andrews truck. Some other roads had a variety of narrow gauge A-3 ride control truck as well; and the EBT used Vulcan trucks, for which I have a pretty decent, well-dimensioned side-frame drawing.

The goal here is to turn whatever prototype data I can get into a 3D CAD model that will then get 3D printed for an investment casting.

So does anyone have any prototype drawings he could share with me?

Thanks,

Dave Queener
Knoxville, TN
Pastor, St. Paul Presbyterian Church
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Owner, Cumberland Model Engineering
www.CumberlandModelEngineering.com (865) 333-5712

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Fender
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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by Fender » Sat Jul 13, 2019 2:15 pm

Is there any difference between the n.g. trucks and standard gauge, besides the length of the axles and truck bolsters, and wheel diameter?
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FLtenwheeler
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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by FLtenwheeler » Sat Jul 13, 2019 2:31 pm

Try contacting Jeff Smith of Branchline Products.

Tim
He who dies with the most unfinished projects: Should of put more time into their hobby.

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davidqueener
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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by davidqueener » Sat Jul 13, 2019 8:34 pm

Fender, there are differences, as you point out. Aside from having different, typically shorter wheelbases than their standard gauge counterparts, and altogether different, narrower truck bolsters, the narrow gauge side frame castings are also much shorter in height, in order to match the lower coupler center height of narrow gauge cars. Narrow gauge journal boxes are typically of a smaller size than their standard gauge counterparts as well, though they follow the same system of sizing (4.125x8, 5x9 and so forth), since their cars generally carry much lighter loads than their standard gauge counterparts.

Some adaptations of standard gauge trucks to 3' narrow gauge have occurred. The one that most prominently comes to mind are the tender trucks on the K-37 2-8-2. The tenders themselves appear to have been almost unaltered from their standard gauge days mated to C-41 consolidations, but their archbar trucks have been modified, maybe not in terms of new bolsters, but by changing the "set" of the original archbars so that the truck bolster rides much lower; and hence, lowering the tender's coal space down to the deck of the K37's cab apron. The distance between the archbar sideframes remains the same as in standard gauge days, but when the original 33" standard gauge wheelsets were refitted with 26" wheels and re-gauged to 3', they retained standard gauge axles, with the same back-to-back dimensions between journal boxes. These trucks were really quite a kitbash, and showed how the financially strapped, D&RGW mechanical department could make do with little.

It would be instructive to see some photos of one of these trucks as it was being rebuilt. I wonder if the folks at the CRRR took pics of the tender trucks on #491 as it was being rebuilt prior to debuting in 2014?

I was once told that some of the 6500 flats may have used re-gauged standard gauge Bettendorf trucks, but this may be an apocryphal tale. Perhaps some D&RGW authority out there would like to chime in. In the meantime, here is a pic of one taken by Jerry Day from over at the Narrow Gauge Discussion Forum:
_8508686.jpg
All for now,

Dave
Pastor, St. Paul Presbyterian Church
www.StPaulPres.com (865) 209-5654

Owner, Cumberland Model Engineering
www.CumberlandModelEngineering.com (865) 333-5712

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Loco112
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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by Loco112 » Wed Jul 31, 2019 5:37 pm

Ive got them. Its going to be the Fall before I can possibly do anything with them.
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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by Cary Stewart » Thu Aug 01, 2019 5:25 pm

Another RR that used these was the Unitah. You might look for the book about the Uintah RR. It did have a lot of drawings.
Cary

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Re: Drawings for 3' Narrow Gauge Bettendorf & Andrews trucks

Post by jeffsmith » Thu Aug 01, 2019 7:35 pm

The D&RGW did have the 4' 11" Bettendorf truck cast for the 6500 flats and later the 9600 pipe gons. Somewhere there is a photo of the very first flat with arch bar trucks under it until the foundry (American Steel Foundries) could get the truck castings finished. The railroad also had ASF cast the Andrews trucks for the Long Reefers and long stock cars. Later they used that same pattern modifying it to make the 4' 8" bettendorf trucks for the frame less tank cars. I am sure this was contracted work by the refineries.

Jeff

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