The race web page is http://altisendurance.com/events/barnum-rail-trail-marathon-and-half-marathon
Local time: 4:49 AM
Entrants will start the race at the southern end of the trail adjacent to the park overlooking the Potomac River and head north on the trail for 3.28 miles. At the 3.28 mile mark runners will turn around and head south back to the start/finish. Half entrants will run this out-and-back twice to complete a half marathon, and marathoners will complete this out-and-back four times to complete a marathon. Please note that the trail is also a rural gravel road for the southernmost mile of the course. A superb description of the trail can be found at http://www.traillink.com/trail/barnum-rail-trail.aspx.