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Aimed at the safety problem of the locomotive under the dynamic braking condition, this paper analyzes the
influence of the coupler and buffer system. The coupler reposition methods of the large rotation angle coupler and the
small rotation angle coupler under longitudinal coupler press force were compared. The influence of coupler and buffer
system to the dynamics performance of locomotive was researched through dynamic simulation. Results show that the
longitudinal coupler press force afforded by large rotation angle coupler with coupler shoulder, is larger than that of small
rotation angle coupler.