1.Buffer head center distance rail surface height: Standard rail vehicles:850mm Subway, light rail and other vehicles:500mm,660mm,678mm,720mm Subway, light rail and other vehicles. 2.Allow the vehicle impact speed: Footless style, according to the user needs to provide 3km / h, 5km / h, 10km / h in three models. There are basic formula: the user needs to provide 60t, 75t, 90t three models. 3.Buffer cylinder Resistance: Footless style, according to the user needs to provide 30t, 45t, 60t three models. There are basic formula: the user needs to provide 60t, 75t, 90t three models. 4.Buffer head size and shape: Standard vehicle is planar, subway, light rail and other vehicles provided by the user to match the size and shape of the coupler. 5.Vehicle kinetic energy absorbed by the buffer tank can be designed according to user requirements.