Re: MU Question - Where to place the faster locomotive? - Grades and couplers
Whatever the grade easement recommendations turn out to be, their necessity adds some
complications to track planning. It increases the horizontal distance needed to achieve a
given height if you want to keep the maximum grade to some ideal percentage, say 2
percent. If the horizontal distance is fixed, then the resulting grade between the two
easements is going to be steeper than might be desired.
--- In firstname.lastname@example.org, "Glen Chenier" <glen@...> wrote:
> Isn't it great how some preliminary testing and experimenting can flush
> out unexpected bugs? Grades can be a real challenge in many ways to
> make them work properly. Vertical easements especially, and not much
> in track planning books about grade transitions. I seem to recall
> reading many years ago someone recommending no more than 1/2 to 1 %
> grade change for every longest locomotive or car length, depending on
> coupler characteristics and distance from wheels to coupler. This was
> worst case, some rolling stock is more forgiving.
> So this begs another question - can anyone suggest from experience
> grade easement recommendations for Z scale?
> --- In email@example.com, "Ellsworth Geib" <geib@> wrote:
> > The purpose of my crude tests was simply getting an idea of how badly
> grades and curves
> > might affect performance and car pulling capacity. I hadn't been
> thinking about the
> > coupler problem. However, it was a clear example of the need to have
> some transition
> > going into a grade, especially when going from a downhill to an
> uphill grade. And of
> > course, going directly from downhill to uphill in the middle of a
> relatively sharp curve,
> > such as the 195 mm, is the worst situation.