Rail system comprising at least one rail part, a slotted waveguide and a vehicle arranged so as to be movable in a rail direction, the slot direction of the slotted waveguide being oriented in parallel with the rail direction of the rail part, the slotted waveguide in particular being arranged on or integrated in the rail part, the vehicle comprising a frame on which a receiving unit is arranged in a rotatably mounted manner, the axis of rotation of the pivot bearing of the receiving unit in particular being oriented in the transverse direction with respect to the rail direction, characterised in that an inspection part is held by the receiving unit, at least one region, facing the slotted waveguide, of the inspection part, in particular an end region, being arranged so as to be deflectable relative to the receiving unit, a sensor means being arranged on the inspection part and/or on the receiving unit for detecting the deflection of the region, the region protruding through the slot of the slotted waveguide into the slotted waveguide at least in part, in particular protruding into the hollow region, in particular therefore the waveguide region, of the slotted waveguide at least in part, the receiving unit being arranged on the frame of the vehicle in a rotatably mounted manner by means of a hinge, in particular in the form of a pivot bearing, a stop part for limiting the degree of rotational freedom of the receiving unit being connected to the frame of the vehicle, the spring force generated by a spring element towards the stop part acting on the receiving part, a first end of the spring element being fastened to the stop part, and the other end of the spring element being fastened to the receiving part. the slot direction of the slotted waveguide being oriented in parallel with the rail direction of the rail part, the slotted waveguide in particular being arranged on or integrated in the rail part, the vehicle comprising a frame on which a receiving unit is arranged in a rotatably mounted manner, the axis of rotation of the pivot bearing of the receiving unit in particular being oriented in the transverse direction with respect to the rail direction, characterised in that an inspection part is held by the receiving unit, at least one region, facing the slotted waveguide, of the inspection part, in particular an end region, being arranged so as to be deflectable relative to the receiving unit, a sensor means being arranged on the inspection part and/or on the receiving unit for detecting the deflection of the region, the region protruding through the slot of the slotted waveguide into the slotted waveguide at least in part, in particular protruding into the hollow region, in particular therefore the waveguide region, of the slotted waveguide at least in part, the receiving unit being arranged on the frame of the vehicle in a rotatably mounted manner by means of a hinge, in particular in the form of a pivot bearing, a stop part for limiting the degree of rotational freedom of the receiving unit being connected to the frame of the vehicle, the spring force generated by a spring element towards the stop part acting on the receiving part, a first end of the spring element being fastened to the stop part, and the other end of the spring element being fastened to the receiving part.