7.1.3   Cold air supply on trucks/trains
When transporting goods by rail or by road, clip-ons may be used to supply cold air to porthole containers, in which case a generator is needed to deliver the required 3-phase power.
In Australia and the USA, clip-ons using liquid nitrogen for refrigeration are also occasionally used. The advantage of this is that no external power supply is required to operate such units.
Figure 8: Transport rack for the return transport of clip-on units for porthole containers (without clip-ons)

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