It's a good question but I did try both Rail options in the FARL settings. One places standard rails, the second places Straight rail with power & Curved rail with power. Unfortunately both choices in the FARL menu are called Rail so I had to double check my work to make sure.
So, yes, ALL the FARL placed rails are titled (as viewed when hovering over any rail segment) as Straight rail with power & Curved rail with power. No power connection is made between hand placed rails and FARL placed rails. FARL placed rails don't even seem to form an electrical network of their own when viewed in the map.