A rack system comprising a rack, a linking member, and a first equipment including a first slide rail assembly, wherein the first slide rail assembly comprises a first rail and a second rail displaceable with respect to the first rail; the rack system further comprising a first interlock device provided between the first rail of the first slide rail assembly and the linking member through the opening; wherein while being displaced from a retracted position with respect to the first rail of the first slide rail assembly to a predetermined position in an opening direction, the second rail of the first slide rail assembly drives the first interlock device and thereby displaces the linking member from a first position to a second position; and wherein a seat member is mounted to a supporting frame of the first rail of the first slide rail assembly, and a first locking member of the first interlock device is movably mounted between the supporting frame and the seat member, and wherein the seat member includes at least two wall portions and forming a space therebetween through which the first locking member is movable; characterized in that the first equipment includes a chassis, wherein the chassis has a wall (44, 224), and the wall (44, 224) has an opening (70, 227), and in that a first engaging member of the first interlock device is movably mounted to a supporting rail via a mount, and the mount or the supporting rail has at least one guiding feature; and in that the mount is movably mounted to the supporting rail by at least one connecting feature extending through a portion of the at least one guiding feature, wherein the first engaging member of the first interlock device can be arranged to the mount via at least one supporting feature. the first slide rail assembly comprises a first rail and a second rail displaceable with respect to the first rail; the rack system further comprising a first interlock device provided between the first rail of the first slide rail assembly and the linking member through the opening; wherein while being displaced from a retracted position with respect to the first rail of the first slide rail assembly to a predetermined position in an opening direction, the second rail of the first slide rail assembly drives the first interlock device and thereby displaces the linking member from a first position to a second position; and wherein a seat member is mounted to a supporting frame of the first rail of the first slide rail assembly, and a first locking member of the first interlock device is movably mounted between the supporting frame and the seat member, and wherein the seat member includes at least two wall portions and forming a space therebetween through which the first locking member is movable; characterized in that the first equipment includes a chassis, wherein the chassis has a wall (44, 224), and the wall (44, 224) has an opening (70, 227), and in that a first engaging member of the first interlock device is movably mounted to a supporting rail via a mount, and the mount or the supporting rail has at least one guiding feature; and in that the mount is movably mounted to the supporting rail by at least one connecting feature extending through a portion of the at least one guiding feature, wherein the first engaging member of the first interlock device can be arranged to the mount via at least one supporting feature.