Snowman,  I first arrived in Fairbanks in 1967, my uncle Ernie was there since ww2...  many of the oldtimers in Fairbanks were talking very loudly about building a gasline down from the Nsloppy since the early 1950's. During the past 2-centuries there was plenty of gas & messy oil all over the place between Barrow & Kaktovik & Tuktoyaktuk. The Newsminer has many old articles discussing a gasline in the 1950's. Katalla Oil was Alaska's first oil-company established 100 years ago, some of the grandkids still talk of a statewide gasline network. How hard was it to build the fuel-pipeline from Haines to Eielson??  In 1970 at UAF we discussed building a gasline from Deadhorse to Fairbanks to provide fuel-energy for the TAPS project, this was the original thinking behind the existing 140mi 10"-12" fuelgasline that terminates at PS4-Galbraith.  That batch of small-bore pipe was purchased early and installed late during the TAPS-circus. Some of that pipe was lost & reordered, hence 2-sizes.