>>2797773The American Discovery Trail website charges money for the gpx data. You're probably better off choosing a slightly different coast to coast trail. The National Park Service has a free map on their website for the Pony Express route.
https://www.nps.gov/poex/index.htmhttps://www.nps.gov/poex/planyourvisit/maps.htmThere's also the very similar California Trail
https://www.nps.gov/cali/index.htmhttps://www.nps.gov/cali/planyourvisit/maps.htm