..or is it 2 (tan 1/12 + tan 1/12), must look up the ARA specs.
--- In [email protected], "Gavin" <csowry@...> wrote:
>
> The British actually use 'straight' frogs, just like in USA, and here in NZ.
> It is the Germans, and some other European railways that use curved frogs.
>
> There is a difference between British/NZ and USA in measuring the frog. The
> geometric angle of a US #6 frog, say, is not the same as a British 1 in 6
> frog.
>
> Off the top of my head, the British formula is tan 1/6, whereas the American
> is 2 tan (1/12 + 1/12).
>
> --- In [email protected], "Ed" <Loizeaux@> wrote:
> >
> > > Only "toy trains" have a curved frog.
> > > AbBaird
> >
> > As a general statement for American railroading that is true. However, in
> > England most real turnouts are made with a curved frog. My NYC-themed
> > layout has almost all curved frogs (and curved adjacent rails) because I
> > use White Oak Models turnouts sold by Kelvin White who lived in Oxford at
> > the time. Even though they are technically incorrect for the NYC and other
> > American railroads, I like them because the longer continuous curve equates
> > to a much larger "real" radius than the typical American design with
> > straight points/curved closure rail/stright frog/curved rail past the frog.
> > Thus, I find it much easier to ease the 4-8-4 Niagara and other 8-coupled
> > wheeled steamers through a #6 turnout in the yards. Ken Reiter's SP 2-10-4
> > also goes through a #6 turnout of this type easily. Yep, bending the rule
> > once in a while pays off. Cheers....Ed L.
> >
>
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