OBD - Array with Rotation applied

Hi all,

I'm doing the trackwork by using the Open Building Designer.

Does anyone know how to array the element (or cell) with certain degree of rotation vertically?

I array the sleeper along the alignment line, however from the straight to curve area, every sleeper is start to rotate slowly from 0° to 3.998° vertically (please refer the dia.1 and dia.2)

Diagram 1 - 0° (Straight)

Diagram 2 - 3.998° (Curve)

This is the result what I want. (Below exp I manually do it for reference only) May I know how to do it?

           

Thank you~

 

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