Help with spacing rails

Hey

I recently been trying to make a curvature in two rails which i did fine but is there a way to make sure they are identical so you can be sure they are parrellel at all times?

I made two different paths and applied it to the objects but they become “wider apart” on the corner.

Any tips on how i can solve this so they are always parrellel ?

Project file (3.5mb)
http://www.civilianuniverse.com/curvetest.blend

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