Ferguson Tractor model TE20
Used on the 1955-58 British Commonwealth Trans-Antarctic Expedition led by Dr Vivian Fuchs. This is one of the three tractors of the New Zealand component, led by Sir Edmund Hillary, that laid supply depots from the Ross Sea towards the South Pole to meet the oncoming main party.
After Hillary's unauthorised dash for the Pole, this tractor was used at the Pole station, then at McMurdo Station, before being brought to Christchurch for preservation.
Though it looks unusual, it is hardly modified from the standard TE20. The extra axle helps support the track, which is readily removable for use on firm ground. The canvas screen gives the driver and engine some meagre protection from icy winds.
Tenuous Link: six legs, six wheels