movement the arms also make an upward movement so that a product container can be picked up from a storage position 4 the trolley 7 has four longitudinal running wheels 17 for movement in the transverse direction and four driven transverse running wheels 18 only two of which are shown in fig2 a and 2 b oriented transversely to the longitudinal running wheels 17 for movement in the transverse direction two opposite longitudinal running wheels 17 as well as two opposite transverse running wheels 18 can be driven by an electric motor with which the trolley 7 is fitted this electric motor when actuated drives the drivable longitudinal running wheels 17 and the transverse running wheels 18 simultaneously the axes of rotation of the running wheels 17 18 are horizontally oriented the trolley 7 further comprises three guide means configured as non driven guide wheels 19 at seen in top plan view three of the four corner points of the trolley 7 the guide wheels 19 have vertical axes of rotation one of the guide wheels 19 is not shown in fig2 a and 2 b fig5 a 5 c also show guide wheels 19 in these figures indicated by numerals 19 1 19 2 and 19 3 the guide wheel 19 1 is rigidly connected to the.