- 13th ANNUAL TROOP 964 MODEL TRAIN SHOW: One of the largest DCC-HO model train layouts in the Mid-Atlantic with more than 114 (2' x 4') scenery modules. Sat., March 12 -- 10 a.m. - 5 p.m.; and Sun., March 13 -- 12:30 p.m. - 5 p.m. Open to the public! Herbert J. Saunders Middle School, 13557 Spriggs Road, Manassas. Adults: $7; Students/Seniors: $3; Under 5: free. Featuring model train layouts by several area model railroading clubs. LEGO and steam-powered model trains, as well as Z-, T-, N-, S-, O-, and G-gauge trains. Boy Scout railroading merit badge workshop available. www.troop964.org.