through Sundays. A cupola caboose near the Trail in Vienna Centennial Park contains a museum that houses materials that the W&OD Railroad once used. Staffed by members of the Optimist Club of Greater Vienna, bearing on its sides the name "WASHINGTON & OLD DOMINION RAILROAD" and numbered 503, the caboose is open to the public during the afternoons on selected weekends and holidays. Near the caboose is a historical marker, an NVRPA information sign, a metallic crossbuck on a wooden post and a metallic marker post that was once located from a station. A metallic white railroad whistle post with black markings is located in Vienna Centennial Park on the north side of the Trail between Church Street NE and the caboose. The W&OD Railroad station in Vienna houses a museum and a model railroad layout. Operated by the Northern Virginia Model Railroaders, Inc., the museum displays materials that the W&OD Railroad once used and a model of the station as it appeared when steam locomotives stopped at the station. The model railroad and museum is open to the public during the afternoon of one Saturday of each month except June and August. The W&OD Railroad station in Herndon houses the Herndon Depot Museum, which the Herndon Historical Society operates. The museum, which is open on Sundays from noon to 3:00 p.m. from March to mid-December, displays photographs and newspaper articles relating to the history of the Town of Herndon and the W&OD Railroad. The museum also contains materials that the railroad once used. The museum additionally contains information about the history of a nearby Norfolk and Western Railway cupola caboose whose sides bore the name and logo of the W&OD Railroad and the number 504 in 2006. A railroad whistle post is located near the caboose An overlook at the Luck Stone Quarry east of Goose Creek displays a large trap rock quarry. This mineral provides bulk for concrete, macadam and paving stones. The W&OD Railroad station in Purcellville houses the Loudoun Visitors Center. The Visitors Center contains a W&OD Railroad historical display and hosts wine-tasting events. The Visitors Center is open from noon to 4:00 p.m. on Saturdays and Sundays from late April through October. Natural resources Most of the landscaping in the park is left in a natural state to preserve green space and to provide wildlife habitat. Some natural areas within the park are contiguous to