| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to the drawings and in particular with reference to FIGS. 1 and 2 there is shown a railroad car 1 which has a refrigeration arrangement or system 2 including a plurality of heat exchanger and venturi units 3 each supplied with liquid nitrogen from tanks 4 by way of lines 5.
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