Abstract: A locking device for securing a contact strip device of a current collector in a storage position, the contact strip device being movable between a storage and sliding contact position relative to a conductor rail. The locking device has a cam, a rotatably mounted shaft and an anti-rotation device, the cam disposed on the shaft in a rotationally fixed manner and the cam movable from a release to locking position by rotation of the shaft, and the cam in the storage position of the contact strip device being able to be brought into contact at a first contact surface by being transferred to the locking position on the current collector in a manner that movement of the contact strip device is blocked relative to the conductor rail, and rotational movement of the shaft for securing the cam in the release or locking position being positively blocked of the anti-rotation device.