Trailheads of the Sierra Vista Trail (on OpenStreetMap):
The trail on OpenStreetMap is labeled as such, and in most places is a dashed red line. The southern portions have it rendered as a dashed brown line.
You can load Sierra-Vista-Trail.kmz into Google Earth to visualize all the trailheads. Add the OpenStreetMap layer as a "Network Link" to compare it against to OpenStreetMap and the trail's actual route.
