Place family based on sloped face with equal distance

Revit
1

Hi,
I want to place the family based on the sloped face with equal distance. Here i attached the 3d model image for referance. My requirement is i just want to place first and last elements with the distance of 225mm from the solid and rest of the elements are 650mm spacing. Please give me a solution for this issue

image
image975×732 135 KB

2

What have you tried so far?
Please review this post How to get help on the Dynamo forums

Personally, I think this would be better to do this in Revit than Dynamo - what happens if your sleepers change?

Set up your sleeper family with a reference planes for the centreline of the rail anchors and the end offsets. Create a line based family with the anchor family using a spacing formula.
Place anchor line using the sleeper face as the host. Align the anchors to the reference planes in the sleeper.

You could group this or create a nested family and you have a fully parametric solution

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