On Thu, 10 Feb 2011 00:53:34 -0000, you wrote:
Gavin,
>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.
I think it more accurate to state that the British railways had
standard crossings (frogs) which are/were straight and which would be
used where possible. But there was also much use of curved crossings
where the situation required it.
I did read a note from one permanent way engineer that the curving
could be applied on site when the turnout was being laid since the
bullhead rail normally used was more flexible that flat bottomed rail.
Jim.
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