What sort of rail sections did the Frisco use for its mainline? As I cannot find any information that would suggest the Frisco used a custom rail section, I'm assuming whatever rails it lay its mainline with were to AREA standards.
There is also a brief discussion about HF rail in this thread... http://www.frisco.org/shipit/index....inues-service-over-lead-belt.4703/#post-32824