Alarm headquarters in a small fire department may consist of one switchboard operator. Most large fire departments have a computerized system of receiving alarms, notifying fire stations, and transmitting data to computer terminals in fire trucks. Many fire departments have several different types of fire trucks. Engines have a large pump that takes water from a fire hydrant or other source. The pump boosts the pressure of the water and forces it through hoses.
Engines carry several sizes of hoses and nozzles.
Many also have a small-diameter hose called a booster line, which is wound on a reel. The booster line is used chiefly to put out small outdoor fires. Engines used for fighting grass or brush fires carry a tank of water and such tools as shovels and rakes. An aerial ladder truck has a metal extension ladder mounted on a turntable. An elevating-platform truck has a cagelike platform that can hold several people.