A transport device, that is arranged to be moveable in certain first direction forward, and which transport device encompasses - a chassis, and - a loading device to pull an interchangeable platform to the transport device in another direction, that forms a sharp angle with the first direction, and which transport device - is arranged to target a gravity support force to the interchangeable platform (200, wherein - the transport device encompasses an unloading device, that is arranged to target in addition to the gravity support force to the interchangeable platform a force, of which - direction forms an obtuse angle or straight angle with the first direction; in which case the transport device is arranged to unload the interchangeable platform from the transport device backwards along the transport device with the aid of the unloading device the transport device further comprising - an arm that is directed or can be directed into such direction that it belongs to a vertical plane encompassing a longitudinal direction of the transport device, - a vertical hinge, by which the arm is arranged to pivot with reference to the chassis, so that a first end of the arm is arranged to be movable in relation to the chassis in a horizontal direction when the transport device is on a horizontal surface; in which case the interchangeable platform can be moved to the transport device and/or from the transport device in a direction that is not parallel with the first direction or opposite to the first direction, - a tilt hinge, by which the arm is connected to the chassis, so that the first end of the arm is arranged to be movable in a vertical direction in relation to the chassis when the transport device is on the horizontal surface, - equipment to fasten the interchangeable platform to one or more of the loading device, an unloading device or a combined loading and unloading device, - at least one winch to move the fastening equipment in a direction of the arm forward and backward, - an unloading reel and an unloading cable such that by reeling the unloading cable to the unloading reel the interchangeable platform may be pulled from the transport device, - at least one roll to guide the interchangeable platform and/or the cable; in which case the transport device is arranged to pull the interchangeable platform to the transport device and unload the interchangeable platform from the transport device backwards by the turning arm and winch, characterized in that the transport device comprises - a loading reel and a loading cable such that by reeling the loading cable to the loading reel the interchangeable platform may be pulled on to the transport device, wherein - the arm is configured to turn by the vertical hinge while loading of the interchangeable platform - the at least one roll is arranged behind the tilt hinge and attached to the arm, and - the interchangeable platform is configured to be lowered to the ground supported by the loading cable. - a chassis, and - a loading device to pull an interchangeable platform to the transport device in another direction, that forms a sharp angle with the first direction, and which transport device - is arranged to target a gravity support force to the interchangeable platform (200, wherein - the transport device encompasses an unloading device, that is arranged to target in addition to the gravity support force to the interchangeable platform a force, of which - direction forms an obtuse angle or straight angle with the first direction; - an arm that is directed or can be directed into such direction that it belongs to a vertical plane encompassing a longitudinal direction of the transport device, - a vertical hinge, by which the arm is arranged to pivot with reference to the chassis, so that a first end of the arm is arranged to be movable in relation to the chassis in a horizontal direction when the transport device is on a horizontal surface; in which case the interchangeable platform can be moved to the transport device and/or from the transport device in a direction that is not parallel with the first direction or opposite to the first direction, - a tilt hinge, by which the arm is connected to the chassis, so that the first end of the arm is arranged to be movable in a vertical direction in relation to the chassis when the transport device is on the horizontal surface, - equipment to fasten the interchangeable platform to one or more of the loading device, an unloading device or a combined loading and unloading device, - at least one winch to move the fastening equipment in a direction of the arm forward and backward, - an unloading reel and an unloading cable such that by reeling the unloading cable to the unloading reel the interchangeable platform may be pulled from the transport device, - at least one roll to guide the interchangeable platform and/or the cable; in which case the transport device is arranged to pull the interchangeable platform to the transport device and unload the interchangeable platform from the transport device backwards by the turning arm and winch, - a loading reel and a loading cable such that by reeling the loading cable to the loading reel the interchangeable platform may be pulled on to the transport device, wherein - the arm is configured to turn by the vertical hinge while loading of the interchangeable platform - the at least one roll is arranged behind the tilt hinge and attached to the arm, and - the interchangeable platform is configured to be lowered to the ground supported by the loading cable.