Yes Ron, tyre width I get. What I don't understand is why are the wing rails raised? Why not just have the same rail depth over the frog as the rest of the track?Ron S wrote: ↑Wed Mar 06, 2019 4:46 am Unfortunately commercial turnouts are made to accept many variations in wheels - tyre width & flange depth.
Ideally tyre widths & flange depths work well when flangeways are all the same and especially at the frog point, tyre widths are in reality, wide enough to bridge the gap and be supported by rail all the time. This can be achieved in the model as well but one has to accept having all the same wheel profiles.
Anyway, looking again at some points, I noticed on a Peco point, the raised wing rail just in front of the 'V' (even though it's tiny), has a little ramp. The Hornby one however, is more, lets say, abrupt.
Therefore, it seems the Peco points introduce the loco wheels to a smoother run up into the wing rails in the 'V'.
That's my understanding of it.........I think