An overlapping unit for the lateral overlapping of portions which are transported in a longitudinal direction and which each comprise at least one slice cut off from a food product, comprising a belt conveyor having at least two tracks (17, 19), wherein an upper track and a lower track are deflected at the incoming side about a common input axle and at the outgoing side about two output axles (27, 29) disposed at different height levels, characterized in that - a common drive, by which the common input axle of the two tracks (17, 19) can be driven, is associated with both tracks (17, 19), with the two tracks (17, 19) differing from one another with respect to their deflection path at the input axle and/or at the output axles (27, 29), wherein the deflection paths at the input axle and/or at the output axles (27, 28) of the two tracks are of different lengths and are achieved by deflection rollers or deflection sleeves (47, 49) having diameters of different sizes, - or in that the conveying speeds of the two tracks (17, 19) are set or settable differently as a compensation for a conveyor length difference between the two tracks (17, 19) - by a separate drive being associated with each output axle (27, 29), - or by two concentric drive shafts, which are pushed into one another and with which a respective separate drive is associated, being provided at the common input axle, - or by the common input axle of a single upper track and a single lower track being designed in split form and being provided with a drive at the left hand side for the one track and with a drive at the right hand side for the other track. comprising a belt conveyor having at least two tracks (17, 19), wherein an upper track and a lower track are deflected at the incoming side about a common input axle and at the outgoing side about two output axles (27, 29) disposed at different height levels, characterized in that - a common drive, by which the common input axle of the two tracks (17, 19) can be driven, is associated with both tracks (17, 19), with the two tracks (17, 19) differing from one another with respect to their deflection path at the input axle and/or at the output axles (27, 29), wherein the deflection paths at the input axle and/or at the output axles (27, 28) of the two tracks are of different lengths and are achieved by deflection rollers or deflection sleeves (47, 49) having diameters of different sizes, - or in that the conveying speeds of the two tracks (17, 19) are set or settable differently as a compensation for a conveyor length difference between the two tracks (17, 19) - by a separate drive being associated with each output axle (27, 29), - or by two concentric drive shafts, which are pushed into one another and with which a respective separate drive is associated, being provided at the common input axle, - or by the common input axle of a single upper track and a single lower track being designed in split form and being provided with a drive at the left hand side for the one track and with a drive at the right hand side for the other track. - a common drive, by which the common input axle of the two tracks (17, 19) can be driven, is associated with both tracks (17, 19), with the two tracks (17, 19) differing from one another with respect to their deflection path at the input axle and/or at the output axles (27, 29), wherein the deflection paths at the input axle and/or at the output axles (27, 28) of the two tracks are of different lengths and are achieved by deflection rollers or deflection sleeves (47, 49) having diameters of different sizes, - or in that the conveying speeds of the two tracks (17, 19) are set or settable differently as a compensation for a conveyor length difference between the two tracks (17, 19) - by a separate drive being associated with each output axle (27, 29), - or by two concentric drive shafts, which are pushed into one another and with which a respective separate drive is associated, being provided at the common input axle, - or by the common input axle of a single upper track and a single lower track being designed in split form and being provided with a drive at the left hand side for the one track and with a drive at the right hand side for the other track. - by a separate drive being associated with each output axle (27, 29), - or by two concentric drive shafts, which are pushed into one another and with which a respective separate drive is associated, being provided at the common input axle, - or by the common input axle of a single upper track and a single lower track being designed in split form and being provided with a drive at the left hand side for the one track and with a drive at the right hand side for the other track.