Have you seen the manuscript done by Robert Trail on the Trail Families of Scotland done through the Frederick County Hisotrical Society near Montgomery Co. Where the Trails settled upon arriving in America from Soctland? It confirms the tie to the Orkney Islands and Blebo Fifeshire Scotland.
Also William N Hurley Jr. Published a book through Heritage Books, Inc. ISBN #0-7884-1831-9(which is out of print and I have a copy) entitled Trail Families of MD that is divided into 10 chapters from John Trail 1475 of Scotland down six generation through David Trail 1695 (1st Trail on American Soil) the remaining 10 chapters have very complete thorough and accurate genealogies of descendants from David James 1730 James 1748 William died before 1783 Susanna Nathan L. Edward northcraft Trail 1784 Gulielma Maria Trail 1794 and so on.
My mother maiden name is Trail and we have old family bibles back to early 1800's with our heritage.Our Branch is from Chaneysville South Hampton Twp Bedford Co PA