A LARGE SPACE VEHICLE FOR THE TRANSPORTATION OF PERSONS, IN PARTICULAR A RAILWAY VEHICLE OF A LOW FLOOR CITY VEHICLE, HAS A VEHICLE BOX, SHOWING A FLOOR (1), SIDE WALLS (2) AND SEATS OF TRAVELERS. TO IMPROVE EVERYTHING THE PROTECTION OF TRAVELERS IN CASE OF ACCIDENT, THE SIDE WALL SECTION (2) DIRECTED TOWARD THE FLOOR (1) IS REINFORCED WITH A CHANNEL (4) OF STABLE CONFORMATION FLOOR, CONFIGURED AS A PRESSURE PROFILE OF EXTRUSION, WHOSE CONSTRUCTIVE WIDTH MEASURED BETWEEN THE EXTERIOR AND INTERIOR SURFACES (4A AND 4B) IS GREATER THAN THE CONSTRUCTIVE WIDTH CORRESPONDING TO THE REST OF STRUCTURE WALL SUPPORT (2) SIDE.
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