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. > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
