A method and apparatus for loading tube bundles on a railcar includes placing the tube bundles lengthwise on the car and stacked above the car to form packs. The wireless handset may be embodied as a full-featured handset that is capable of operating either within a wireless network or in a direct handset-to-handset communication mode that is independent of the wireless network. The SLD also includes a mechanism for prohibiting cystoscope rotation. The method may further include forming a sourcedrain region in the first and second recesses.