Statistics for 1956-66 show that mine transportation accidents accounted for 19 percent of fatalities in bituminous coal mines, second only to roof deficiencies as a cause of death. Productivity per manshift increased from 10.2 Tons in 1956 to 18.4 Tons in 1966, but the fatalities per million man-hours of exposure also increased from 0.19 to 0.21 During that same period, indicating that transportation hazards still persist. The data were processed by computer to find what constitute hazardous conditions and unsafe actions as well as to correlate occupation and age of victims, transportation type, and mine production. Findings show that unsafe actions of personnel and hazards created by environmental deficiencies or equipment malfunction contribute equally in causing transportation accidents. Accordingly efforts should be directed toward improving working conditions, equipment maintenance, and education and training of employees. The trend is toward using safer modes of transportation, notably conveyors. More attention should be given to track haulage operation, railroad yards, and nondestructive field testing of materials.