and he notes -

Not t' pull the pin on couplers but has anyone considered the 
non-scale appearance of S Gauge wheels? None of the suppliers offer a 
33 or 36" wheel with the correct contour.

While the front face appears to be correct the rear is not. Prototype 
wheels have a contour not a flat surface and older cast wheels have 
'brackets' or ribs to facilitate cooling as well as add strength.

Here is a photo of a cast wheel set offered in H0 (these would have 
been used on older cars):

http://www.trainsetsonly.com/page/TSO/PROD/920-21254

Drawings of this type wheel can be found at (scroll down to 33" car wheels):

http://prr.railfan.net/diagrams/PRRdiagrams.html?sel=whandx&sz=sm&fr=

Modern forged wheels in use for the last fifty or so years have an 
inside contour which can be seen here:

http://www.vintagemaineimages.com/bin/Detail?ln=15236

On this site we find an animated view of a roller bearing truck 
(place the cursor over "Railroad Products" and click on "wheels"):

http://www.amsted.com/

Here is a prototype supplier with an interesting exploded view of a 
roller bearing truck

http://www.railserve.com/jump/jump.cgi?ID=3790

Many years ago Culp Bros. offered a die-cast freight car wheel with 
ribs but no one has done so since. Even the brass imports have turned 
wheels and while the front is contoured, the back is not.

http://www.modeltrainwiki.com/tiki-index.php?page_ref_id=75

The same is found at SHS and AM:

SHS (scroll down and click on "Wheelsets")

http://www.showcaseline.com/index2.html

AM (Scroll down to trucks):

http://www.americanmodels.com/misc/wheels.html

It might be impractical for a manufacturer to offer a die-cast ribbed 
car wheel (although it could be done in lost wax) but surely a forged 
wheel with a contoured back is feasible even on a screw machine. Just 
a thought of course - but it seems that so much attention is paid to 
couplers and yet we ignore the very foundation of a railroad car - the wheels!

Raleigh on a boring night in Maine...


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