These rails have been slightly extended to accommodate gradients that cannot be handled by standard rails. Having a few of these on hand can be very useful in a pinch.
Since it can be difficult to identify these slightly extended rails without any visual cues, I've added a bridge in the center, with a width that corresponds to the extended portion.
I've created a reference table showing the gradients that each of these rails can handle.
Please take a look.
(Rails of “Normal ver.” are here : https://www.printables.com/model/1083695-straight-rails-fir-gravitrax-normal-version)
The author marked this model as their own original creation.