Research conclusions: ( 1 ) When the train passes through the single junction track with small track spacing，the otation angle of the bogie on worst position was in the allowable range of the bogie structure property． The rotation angle and stroke of the train couple on the worst position were in the allowable range of the train couple structure property． ( 2) The train speed did not exceed the 20 km/h when the train run on the single junction track with 3． 4 m track spacing in side direction without passenger． The train speed did not exceed the 15 km / h when the train run on the single junction track with 3． 4 m track spacing in side direction with passenger．