Abstract: Lockers of various designs, like those installed in railroad stations as self-service lockers for temporary storage of hand luggage are equipped with electromechanical remote control devices to permit opening or closing of the locker doors. The devices are connected to a central control unit. Coin testing devices and devices for measuring storage time are provided solely at a central location in the control unit for all of the lockers. A key card is issued as a receipt for the assigned and occupied locker, the card having a magnetic strip in which the number of this assigned locker and test data information are stored. Each time a locker is reassigned, the test data information on the newly issued key card assigned to this locker for the most recent use is modified in such manner that it no longer corresponds to any test data information issued earlier.