Long stretches of paved trails that snake through the lush, green, wooded forest areas of the northwest Atlanta suburbs are the hallmark of the Silver Comet Marathon & Half Marathon, for an event that usually sees more than 1,500 runners each year. The half marathon route (like the full marathon) follows the Silver Comet Trail, the now-paved multi-use trail for bikers, joggers and walkers that winds nearly 40 miles from Smyrna to the Georgia-Alabama state line, part of one of Atlanta’s most successful rails-to-trails initiatives. Named for the Silver Comet train that ferried passengers back and forth from Atlanta to Anniston, Ala., in the 1940s and 50s, the trail had been abandoned until the late 1980s, when a group of local residents formed a nonprofit to raise funds toward converting it for recreational use. Ever since, the trail has become one of the metro Atlanta area’s most popular weekend hikes and biking trails.