City of Alexandria Est. 1749
—Potomac Yard —Certain rail classification yards depended on a simple landform called the "hump." Potomac Yard had two humps: one for the northbound trains and one for the southbound trains. Trains first entered a receiving yard where locomotives were detached from trains and cars were sent to a classification yard over the hump: a hill built between the two yards. After being pushed to the top of the hump by a yard locomotive, cars were uncoupled in specific groups and allowed to roll down one of several different tracks to become part of a new train. This group of tracks formed the classification yard. This system used gravity—and a good deal of pre-planning by track managers—to make classifying (or sorting) rail cars much easier.
|Placed By||City of Alexandria|
|Marker Condition||No reports yet|
|Date Added||Sunday, April 1st, 2018 at 7:02am PDT -07:00|
|UTM (WGS84 Datum)||18S E 322162 N 4299082|
|Decimal Degrees||38.82258333, -77.04855000|
|Degrees and Decimal Minutes||N 38° 49.355', W 77° 2.913'|
|Degrees, Minutes and Seconds||38° 49' 21.3" N, 77° 2' 54.78" W|
|Driving Directions||Google Maps|
|Area Code(s)||202, 703, 571|
|Which side of the road?||Marker is on the right when traveling North|
|Closest Postal Address||At or near Potomac Yard Trail, Alexandria VA 22314, US|
|Alternative Maps||Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap|
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