@mwb posted:They were produced in both scale, and also insulated and uninsulated, so you have to be a little careful buying these,
Wow, you're right. I just checked the pair shown in the initial photo, and although the flanges are smaller (and therefore "2 rail") they are indeed NOT insulated.
That's not a deal breaker, as I'm sure I will find something to put these on, but it's good to know for future reference. Thanks for pointing that out.
Mark in Oregon