Roller carriage for displaceable linear guidance in a longitudinal direction on a rail element, wherein the roller carriage comprises a carrier, a first roller or a first pair of rollers, a second roller or a second pair of rollers, and a third roller or a third pair of rollers, wherein every one of the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller (1, 2, 3) or the third pair of rollers is mounted on the carrier such that each can rotate about a rotating axle (13, 14, 15), wherein the rotating axles (13, 14, 15) are substantially parallel to one another, and wherein the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller or the third pair of rollers are disposed on the roller carriage such that the first roller or the first pair of rollers can be brought into engagement with a first track of the rail element and the second roller or the second pair of rollers and the third roller or the third pair of rollers can be brought into engagement with a second track of the rail element, wherein one of the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller or the third pair of rollers is mounted such that it can move in a transverse direction perpendicular to the longitudinal direction relative to the carrier, and wherein the movably mounted roller (1, 2, 3) is resiliently pretensioned in transverse direction by a first spring element, wherein the roller carriage comprises a lever which can be pivoted relative to the carrier about a pivot axis, wherein the lever comprises a first arm, wherein the movably mounted roller (1, 2, 3) or the movably mounted pair of rollers is mounted on the first arm such that it can rotate about the rotating axle (13, 14, 15), and wherein the lever is resiliently pretensioned in a pivoting direction by the first spring element, characterized in that the lever comprises a second arm, wherein the pivot axis divides the lever into the first arm and the second arm, wherein a brake shoe which can be brought into engagement with the first track is disposed on the second arm, so that the movably mounted roller or the movably mounted pair of rollers can be pivoted from a guiding position into a free position and at the same time the brake shoe can be pivoted from a released position into a braking position. wherein the roller carriage comprises a carrier, a first roller or a first pair of rollers, a second roller or a second pair of rollers, and a third roller or a third pair of rollers, a carrier, a first roller or a first pair of rollers, a second roller or a second pair of rollers, and a third roller or a third pair of rollers, wherein every one of the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller (1, 2, 3) or the third pair of rollers is mounted on the carrier such that each can rotate about a rotating axle (13, 14, 15), wherein the rotating axles (13, 14, 15) are substantially parallel to one another, and wherein the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller or the third pair of rollers are disposed on the roller carriage such that the first roller or the first pair of rollers can be brought into engagement with a first track of the rail element and the second roller or the second pair of rollers and the third roller or the third pair of rollers can be brought into engagement with a second track of the rail element, wherein one of the first roller or the first pair of rollers, the second roller or the second pair of rollers and the third roller or the third pair of rollers is mounted such that it can move in a transverse direction perpendicular to the longitudinal direction relative to the carrier, and wherein the movably mounted roller (1, 2, 3) is resiliently pretensioned in transverse direction by a first spring element, wherein the roller carriage comprises a lever which can be pivoted relative to the carrier about a pivot axis, wherein the lever comprises a first arm, wherein the movably mounted roller (1, 2, 3) or the movably mounted pair of rollers is mounted on the first arm such that it can rotate about the rotating axle (13, 14, 15), and wherein the lever is resiliently pretensioned in a pivoting direction by the first spring element, characterized in that the lever comprises a second arm, wherein the pivot axis divides the lever into the first arm and the second arm, wherein a brake shoe which can be brought into engagement with the first track is disposed on the second arm, so that the movably mounted roller or the movably mounted pair of rollers can be pivoted from a guiding position into a free position and at the same time the brake shoe can be pivoted from a released position into a braking position.