Side wall of rail vehicle and stiffening beam thereof

The utility model discloses a side wall of rail vehicle and stiffening beam thereof, stiffening beam are used for strengthening the side wall board of rail vehicle, the both sides of stiffening beam are equipped with the edge of a wing, the edge of a wing is equipped with a plurality of plug welding hole, so that the edge of a wing can with the laminating of side wall board is carried out the plug welding and is fixed. The stiffening beam of this kind of structure based on the edge of a wing and upward plug welding hole's setting, when welded fastening stiffening beam and side wall board, only need weld in the plug welding hole position, and the weld heat input volume is little, and welding rear side wallboard deflection is less, and then the side wall board can adopt flat structure, need not to carry on the die mould and handles, not restricted by the mould, and structural adaptability is good, and manufacturing cost can be effectively controlled.