Es gibt Hinweise inklusive Fotos zu einer Spur in Oregon :
https://www.facebook.com/groups/ForgottenOregon/posts/3927077867560122
And many thanks to Michael Bucci and the Facebook guys from Oregon for the information!
44° 1’41.20”N 118° 6’26.99”W
44° 0’15.45”N 117°44’16.30”W