A railway train carriage, comprising: a floor; and a plurality of rows of seats arranged on the floor and arranged along a length direction of the carriage, wherein a continuous slide rail assembly extending along the length direction of the carriage is arranged under an upper surface of the floor, a sliding member is arranged in the slide rail assembly, each of the seats is mounted on the slide rail assembly through the sliding member and is capable of being moved along the slide rail assembly, and the floor is provided with a recessed groove corresponding to the slide rail assembly and used for avoidance, a bottom part of the seat is connected to the sliding member of the slide rail assembly through the recessed groove, the slide rail assembly comprises a base connected to a carriage bottom plate and a slide groove arranged at an upper portion of the base and extending along the length direction of the carriage, the slide groove has an upward opening that is aligned with the recessed groove, and the sliding member is arranged in the slide groove and is capable of being moved along the slide groove, and a supporting device is arranged between the base and the slide groove, wherein the supporting device comprises a supporting member and a buffering member arranged at each of two sides of the supporting member, characterized in that an upper cover is arranged at each of two sides of buffering members, the buffering member is L-shaped and comprises an upper buffering member arranged vertically and a lower buffering member arranged horizontally, the upper buffering member is located between an inner side of the upper cover and the supporting member, and the lower buffering member is located between a lower surface of the upper cover and the base. a floor; and a plurality of rows of seats arranged on the floor and arranged along a length direction of the carriage, wherein a continuous slide rail assembly extending along the length direction of the carriage is arranged under an upper surface of the floor, a sliding member is arranged in the slide rail assembly, each of the seats is mounted on the slide rail assembly through the sliding member and is capable of being moved along the slide rail assembly, and the floor is provided with a recessed groove corresponding to the slide rail assembly and used for avoidance, a bottom part of the seat is connected to the sliding member of the slide rail assembly through the recessed groove, the slide rail assembly comprises a base connected to a carriage bottom plate and a slide groove arranged at an upper portion of the base and extending along the length direction of the carriage, the slide groove has an upward opening that is aligned with the recessed groove, and the sliding member is arranged in the slide groove and is capable of being moved along the slide groove, and a supporting device is arranged between the base and the slide groove, wherein the supporting device comprises a supporting member and a buffering member arranged at each of two sides of the supporting member, characterized in that an upper cover is arranged at each of two sides of buffering members, the buffering member is L-shaped and comprises an upper buffering member arranged vertically and a lower buffering member arranged horizontally, the upper buffering member is located between an inner side of the upper cover and the supporting member, and the lower buffering member is located between a lower surface of the upper cover and the base.