Of course I have no problem when my Rail scaling is // and have some points down and on the Z axe
And also because I have made that with a curve line who have also only 2 points over the path on the Z! -works fine
And want to know if it's the same with a straight line

I have just asked for know if it was pertinent or not

In fact I suppose that this rail scaling can be considered as a sort of third rail?