Train braking is to artificially stop the movement of the train,which is extremely important to the operation safety in the railway marshalling station and train shunting.The traditional train deceleration usually uses the retarder to as-sist the train braking system to slow down the train.However,when the retarder is installed and used,it mostly adopts the way of opening installation holes on the rail and fixing them with bolts.The installation method is complex,and the perfora-ted installation will damage the strength of the rail.Therefore,this project improves the design of the train deceleration de-vice based on the retarder,and proposes a train auxiliary deceleration device to solve or alleviate the technical problems exist-ing in the existing projects,which is of positive significance to the safety of train operation.