A safety protection device for the roof construction of a train body assembly comprises two arch bridge shaped transverse walking boards and a safety rope, wherein the safety rope is fixed between the span of the two arch bridge shaped transverse walking boards. The sealing element is mounted between a radial shoulder of the body and a radial face of the holding element. An actuator in said firearm is adapted to actively move said trigger bar between a first position and a second position. Air is circulated through the desiccant to reduce air humidity in the vehicle passenger compartment.