Box underframe end structure of railway vehicle

A box underframe end structure of a railway vehicle, comprising

• an underframe boundary beam,
• an end beam,
• a front draft sill,
• a coupler mounting seat,
• a rear end cross beam located on one side in a rear of the front draft sill,
• an end floor fixed between the end beam and the rear end cross beam, and
• a coupler cross beam fixed with the coupler mounting seat into a whole, wherein
• a draft sill comprises the front draft sill and a rear draft sill respectively arranged on a front side and a rear side of the coupler mounting seat,
• the coupler cross beam, the rear end cross beam, and the end floor are welded and fixed with underframe boundary beam, and
• the front draft sill, the rear draft sill, and the coupler cross beam are welded and fixed on a lower surface of the end floor, wherein the underframe boundary beam comprises a lower boundary beam located below the underframe boundary beam and close to one side of the end beam, and a left end and right end of the coupler cross beam and the end beam are welded on an inner side of the lower boundary beam.