On-The-Line : An indication that a fire company or fire fighting unit is back in its own quarters and is ready to resume its assignments. See: In-Service, On-The-Rig, On-Track
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}