Railroad Grade Trail is a 3 mile heavily trafficked trail located near Concrete, WA and is rated as difficult. The trail is primarily used for hiking and is accessible from June until November.
Directions from Sedro-Woolley: Follow State Route 20 east for 17 miles to milepost 82. Turn left on the Baker Lake Hwy. (Forest Road #11). At 12 miles, turn left on Road #12. Travel 3 miles to the junction of Road #13. Stay to the right and follow Road #13 for 6 miles. The trailhead is located at the end of Road #13. Overnight campsites are available at the trailhead.
Nice little side trail from the Park Butte trail. The trail follows a ridge line all the way to the glaciers on Mt Baker. I've read several comments about how the trail is sketchy in parts and how steep the drop offs are on either side but I thought it was fine. It does climb continuously however since you are hiking up the base of Baker. But it does offers some nice close up views of the glaciers and some excellent campsites.