Job aid means information regarding other than main track physical characteristics that supplements the operating instructions of the territory over which the locomotive or train movement will occur. See definitions of‘‘main track’’ and ‘‘physical characteristics’’in this section. A job aid may consist of training on the territory pursuant to § 242.119, maps, charts or visual aids of the territory, or a person or persons to contact who are qualified on the territory and who can describe the physical characteristics of the territory.At a minimum, a job aid must cover characteristics of a territory including:permanent close clearances,location of permanent derails and switches, assigned radio frequencies in use and special instructions required for movement, if any, and railroad identified unique operating conditions.