The present invention relates to holding equipment at an operating table. In order to removably provide equipment at a patient support, a holding device (10) is provided that comprises an accessory rail (12) and at least a first portion (14) of a coupling is provided. The accessory rail is configured as an attachment interface (16) for temporal attachment of equipment (18) at a patient support (20). The accessory rail is rigidly connected to the first portion of the coupling. The first portion of the coupling is configured to provide, in interaction with a second portion (22) of the coupling, a movable connection for connecting the accessory rail to a patient support, wherein the movable connection is configured to provide a horizontal sliding movement of the accessory rail in relation to the patient support. The provision of a movable connection allows, for example, to temporarily move or even remove the accessory rail together with mounted equipment. For example, during an intervention procedure, for certain phases, the equipment is not needed or a different configuration is needed, and wider access to the patient is required. The equipment can then easily be removed and put back in place.