August 3, 2019, 6:30am starts at west end of Dahlgren Rail Trail, runs 15.5 miles to the east end and returns. West end is on Rt 605 in King George County. Fast. flat, all off pavement course. Post race burgers. Tech shirts. Finisher Awards. Cash prizes with $100 course record bonuses. Men 3:10:26, Women 3:39:26. Both set in 2014 and were the fastest 50km on dirt in US that year. Also, trail half-marathon starting at 8am.