gregc 7j43k I believe I do. then you undetrstand that there's no need for any in a yard
7j43k I believe I do.
then you undetrstand that there's no need for any in a yard
No, I do not understand that.
Ed
7j43kI believe I do.
greg - Philadelphia & Reading / Reading
gregc do you understand the purpose of easement leading to curves?
do you understand the purpose of easement leading to curves?
I believe I do. And I think "purpose" should be plural.
Several sources of prototype information I have suggest that almost all railroad curves are layed out as parabolic segments, not as constant curves.
The smaller the change in direction, the more likely the curve will never actually reach a constant radius situation. Think of them as two easements back to back, or a segment out of the small radius end of an elipse.
The NMRA data sheets have drawings and formulas for laying out such a curve.
I can't post any supporting documents right now, not home and all my documents on this are in those silly old fashioned things called books.
Sheldon
I know that most mainline curves were eased. I am wondering how far that concept extended into yard trackage.
In particular, I am wondering if it would have been applied to a wye used to turn passenger cars. I know that prototype passenger cars could generally take a 48" curve equivalent. But I'm wondering if that 48" was eased or not.
I think it's fine to have opinions, but what I'm after is info from someone who KNOWS.
There used to be a guy who lived across the street who would have known. Sadly, he's "gone". Nice guy, and missed.
Anyway, if there's a railroad guy here who DOES know, I'd appreciate the sharing.
Thanks,