The track shoe is
a forged steel body. On first thought, steel might be the metal
of choice for the heat sink block. (But
steel would add excessive weight to the track, reducing speed and fuel
efficiency. And steel has relatively low thermal conductivity. An
alternate approach is to use a low density, high thermal conductivity
metal for the heat sink block. That metal would more effectively pull
the heat out of the rubber and back into the steel base.
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