A car of a public transport vehicle, in particular a railway vehicle, comprising at least one passenger reception room, said reception room being bounded by at least first and second side walls, a ceiling and a floor, the reception room being arrangeable between an open configuration and a compartmentalised configuration in which the reception room comprises at least one removable partitioning device extending between the first and second side walls in a transverse direction substantially normal to the first and second side walls, the partitioning device being capable of separating a first zone of the reception room from a second zone of the reception room, the partitioning device comprising at least: - a support structure for securing the partitioning device to the ceiling, the floor and at least one of the side walls; - at least one partition (42, 43) removably mounted on the support structure, the partition (42, 43) extending in height between an upper edge and a lower edge and in the transverse direction between a lateral edge and a free edge, the free edge delimiting, at least in part, a through-opening between the first area and the second area; and - a panel, the panel being movable between a plurality of positions, including a closed position in which the panel completely closes the through opening, the panel being configured to slide on the support structure, characterised in that the car comprises inserts integral with the ceiling, the floor and the at least one side wall, the support structure being secured in the car via fastening means associated with the inserts, the support structure comprising at least one lower support removably attached to the floor of the car, the lower support being formed by a guide extending substantially in the transverse direction and on which the lower edge of the partition (42, 43) is mounted at least in part, the guide defining an interior space in which the sliding panel is slidable in a compartmentalised configuration. - a support structure for securing the partitioning device to the ceiling, the floor and at least one of the side walls; - at least one partition (42, 43) removably mounted on the support structure, the partition (42, 43) extending in height between an upper edge and a lower edge and in the transverse direction between a lateral edge and a free edge, the free edge delimiting, at least in part, a through-opening between the first area and the second area; and - a panel, the panel being movable between a plurality of positions, including a closed position in which the panel completely closes the through opening, the panel being configured to slide on the support structure, characterised in that the car comprises inserts integral with the ceiling, the floor and the at least one side wall, the support structure being secured in the car via fastening means associated with the inserts, the support structure comprising at least one lower support removably attached to the floor of the car, the lower support being formed by a guide extending substantially in the transverse direction and on which the lower edge of the partition (42, 43) is mounted at least in part, the guide defining an interior space in which the sliding panel is slidable in a compartmentalised configuration.