Quote from the North County Outlook:

The Snohomish County Historic Preservation Commission will host “Centennial Trail History Day” on July 21, from 11 a.m. to 3 p.m., on the trail.  There will be activities for kids, hands-on interactive exhibits, and a chance to touch historic artifacts at six different sites along the 30 miles of historic rail line. It is free and open to the public. 

This is not a BIKES Club activity, but BIKES members might be interested.