A junction for transporting sample racks in an analytical system having one or more work cells for processing samples are disclosed. In one embodiment, the junction may include a main transport line, a turntable having a rotatable transport line, and one or more bypass transport lines. The main transport line can transport first sample racks and second sample racks having different sizes via the turntable. The turntable further comprises a recess for diverting second sample racks from the main transport line to the bypass transport line or vice versa when rotated.