making real-time adjustments as necessary based on rail traffic conditions and delays. The crew dispatcher is normally assisted by a crew caller whose responsibility is to telephone the train and engine crews to advise them of time to report for duty. The crew dispatcher is also responsible for checking that each train and engine crew are properly qualified for their assignments and have had proper rest according to labour regulations. Airline or flight dispatchers A flight dispatcher assists in planning flight paths, taking into account wind speed, storms, aircraft performance and loading, and other conditions. Some dispatchers provide a flight following service and advise pilots if conditions or paths change. They usually work in the operations or control center of the airline. Working conditions and environment Dispatchers are responsible for monitoring all of the communications within a specific geographic area. Public safety dispatchers are responsible for all emergency communications that occur within the jurisdiction of their department. These workers receive and document incoming calls, transmit messages to appropriate personnel, and keep logs of the daily activities of their personnel. Public safety dispatchers usually work in a police station, a fire station, or a hospital. Other dispatchers work in centralized communication centers associated with their specific company or service. Dispatchers of all kinds work with multiple communications systems depending on their function. These systems can include but not limited to telephones, radios, computers and computer-aided dispatch programs, video surveillance cameras, and ground-to-aircraft messaging systems such as ACARS. As a result of sitting for long periods and using such equipment, dispatchers can develop eye strain and back problems. Many dispatchers must also work irregular hours to provide 24-hour service, which includes night, weekend, and holiday hours. Public safety dispatchers are usually the first point of contact between emergency services and the public. When receiving incoming calls for help, these dispatchers must ascertain the nature, location, and extent of the emergency. Callers requesting emergency assistance are often in a state of heightened emotional distress, which can make it difficult to obtain the information needed to handle the call appropriately. The working conditions of a public safety dispatcher may be particularly stressful compared to others because handling a call incorrectly may delay or misdirect emergency personnel, which could result in serious injury or even death. Human error can also produce deadly results for other types of dispatchers. A train dispatcher in Spain was found