Buses often combine high occupancy loads, limited pathways for egress, and the involvement of passengers with limited mobility. In the event of a fire, the potential for passenger injury and loss of life is significant. Additionally, there can be substantial financial losses due to equipment loss and service interruption. In order to prevent future occurrences, it is critical to thoroughly investigate bus fires and develop an understanding of their causes. The causes of non-arson bus fires typically can be categorized as electrical, friction at the wheel level, or engine component failures. This paper examines actual fire occurrences, their root cause investigation, and the measures that were taken to prevent future incidents.