Jun, 2010 
Modern Materials Handling Magazine
"Yard Management Systems(YMS):...In addition to automatically tracking the location of trailers, like an asset management system, a YMS can collect data like when a trailer arrived at the gate, how long it sat in the yard, and how long it took to load or unload. The system can then share that information with a WMS or TMS system to coordinate warehouse and transportation processes. "

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