Re: Boxpoc

[mccallum@melbpc.org.au (John McCallum)]

In article <6f46g9$9qe$1@nnrp1.dejanews.com>, d8225hn1@ozemail.com.au wrote:

>In article <3514EEEA.45813925@eis.net.au>,
>  Greg Olson-Hyde <datamech@eis.net.au> wrote:


>Boxpok (note spelling) wheels were one of several proprietary brands of cast
>steel disk wheels.Believe it or not, the standard spoked wheel has
>considerable flexibility (!)in the spokes and this causes looseness between
>wheel centre and tyre. Disk wheels gave more consistent support to the tyre
>throughout its circumference.
>Boxpok wheels were quite commonly used on modern US locomotives. Southern Rly
>(UK) Merchant Navy, Battle of Britain, West Country and Q1 classes used a
>similar concept wheel, but which was built up, not cast. It was patented, and
>known as the BFB (Bulleid-Firth-Brown) wheel. Another attempt to solve the
>flexibility problem, used here in Australia, was the SCOA-P wheel, which had
>U-shaped spokes for greater rigidity. It was used on QR BB18 1/4 class, VR j
>and R classes, and TGR M and H classes.




I wonder if the Y shaped spokes used on WAGR Pm, Pmr, DD and S classes plus 
ASG and TGR MA classes were made for the same reason? I also wonder if they 
were effective in that regard.


John McCallum