An arrangement for the collection of timber members and the formation of layers of timber members for a timber package, each of said layers having a pre-determined width, comprising: - a feed transporter having several endlessly running transport elements that move around a pathway with a pre-determined speed and on which transport elements the timber members distributed with gaps between them are transported in a direction transverse to their length, and - a collection transporter arranged to receive the timber members from the feed transporter and to collect them together into layers in a layer-constructing step, the collection transporter having a plurality of endlessly running transport elements that move around a pathway, wherein the transport elements of the feed transporter and the transport elements of the collection transporter are displaced sideways from each other and are partially interacting with each other at their ends that meet in order to allow timber members to be transferred between them at a first transfer point defined as an intersection in a pathway of motion between the transport elements of the feed transporter and the transport elements of the collection transporter, and wherein the feed transporter and the collection transporter are synchronised with such speeds relative to each other that the gap that appears between transferred timber members is reduced, and that transferred timber members come into contact with each other at the collection transporter in the layer constructing step, characterised in - that the collection transporter comprises a number of collection segments that are arranged next to each other and lie transverse to the direction of feed of the timber members, each one of said collection segments comprises a first sub-transporter and a second sub-transporter arranged next to each other, each one of the sub-transporters has one of said endlessly running transport elements that move around a pathway, - that the transport element of each sub-transporter (20A, 20B) is equipped along a radially outwardly directed part of the sub-transporter's circumference with a timber-carrying surface (27A, 27B) located at a level somewhat above the transport element, - that the first sub-transporters are driven by a first electric motor with a rate of revolution that is regulated and the second sub-transporters are driven by a second electric motor with a rate of revolution that is regulated, whereby the speed of the first sub-transporters and the speed of the second sub-transporters are varied independently of each other, such that the first sub-transporters receive and collect one layer of timber members while the second sub-transporters at the same time accelerate a previously formed layer of timber members to a speed adapted to the speed of a transfer arrangement by which a layer is transferred, and vice versa. - a feed transporter having several endlessly running transport elements that move around a pathway with a pre-determined speed and on which transport elements the timber members distributed with gaps between them are transported in a direction transverse to their length, and - a collection transporter arranged to receive the timber members from the feed transporter and to collect them together into layers in a layer-constructing step, the collection transporter having a plurality of endlessly running transport elements that move around a pathway, - that the collection transporter comprises a number of collection segments that are arranged next to each other and lie transverse to the direction of feed of the timber members, each one of said collection segments comprises a first sub-transporter and a second sub-transporter arranged next to each other, each one of the sub-transporters has one of said endlessly running transport elements that move around a pathway, - that the transport element of each sub-transporter (20A, 20B) is equipped along a radially outwardly directed part of the sub-transporter's circumference with a timber-carrying surface (27A, 27B) located at a level somewhat above the transport element, - that the first sub-transporters are driven by a first electric motor with a rate of revolution that is regulated and the second sub-transporters are driven by a second electric motor with a rate of revolution that is regulated, whereby the speed of the first sub-transporters and the speed of the second sub-transporters are varied independently of each other, such that the first sub-transporters receive and collect one layer of timber members while the second sub-transporters at the same time accelerate a previously formed layer of timber members to a speed adapted to the speed of a transfer arrangement by which a layer is transferred, and vice versa.