A transport device unit for a transport device assembled using a plurality of transport device units is presented. The transport device unit comprises a base plate module with a base plate for fixing the transport device unit to a support frame, an actuator module with a plurality of electro-magnetic actuators, where the actuator module is supported by the base plate module, and a driving surface module with a driving surface element, where the driving surface element is arranged above the actuator module covering the actuators and configured to carry sample container carriers. A transport device, a system for at least partially disassembling the transport device, and a laboratory sample distribution system comprising a transport device are also presented. In addition, a laboratory automation system comprising a laboratory sample distribution system is also presented.