Why are the fire engines left running on calls?

In the fire station, engines are always plugged into a “shore line” to keep the batteries charged and the engine warm so it is ready to go.  This is not an option while on scene. Power from the running engine is required to run the pump and distribute water. It is also needed to control climate within parts of the engine to properly store and transport medications that may be needed during a medical emergency. The motor also powers lights and emergency flashers.

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1. Where are the fire stations located in town?
2. When do I change my smoke detector batteries?
3. Why do both a fire truck and an ambulance always show up for a medical emergency?
4. Why do so many units respond to “simple” incidents?
5. Why do fire trucks go through a red light with lights & sirens then turn off their lights and slow down?
6. Why do firefighters go to the grocery store together on a fire truck while on duty?
7. Why are the fire engines left running on calls?