| http://www.w3.org/ns/prov#value | - [4] This definition is a variation of the broader term ???Key Train??? in AAR Circular No. OT-55-N, which includes a train with ???20 car loads or intermodal portable tank loads of any combination of hazardous material.??? AAR, Recommended Railroad Operating Practices for Transportation of Hazardous Materials, Circular No. OT-55-N (Aug. 5, 2013), available at http://www.boe.aar.com/CPC-1258%20OT-5
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