1千克力=9.8N,1吨力=9.8kN, 换算因素为9.8kN/吨力启动牵引力=428KN/(9.8kN/吨力)=43.7吨力,持续牵引力=308KN/(9.8kN/吨力)=31.43吨力。这是火车吧!