It is visible, from cuttings, valves, pig launchers, meter stations, markers etc... the other details are from the public domain https://pvnpms.phmsa.dot.gov/PublicViewer/ and other details researched via https://elibrary.ferc.gov/eLibrary/search, a government database containing 2 million regulatory documents related to the US power sector (probably hundreds of millions of pages), you'll find basically everything there if you know how to use it.