Signal failure refers to a situation where communication signals, such as those used in telecommunications or transportation systems, are disrupted or lost. This can occur due to various reasons, including technical malfunctions, environmental factors, or human error. In the context of railways, signal failure can lead to delays and safety concerns, as trains rely on signals to manage their movements. In telecommunications, signal failure can affect phone calls, internet connectivity, and data transmission. Factors like weather conditions, equipment damage, or network overload can contribute to these failures. Addressing signal failure often requires troubleshooting and repairs to restore normal operations and ensure reliable communication.