Corn-Cob was an informal term, promoted by the editors of NZ Railfan magazine, describing a New Zealand railway locomotive livery (resulting from the combination of green and yellow in the colour scheme) found in common usage amongst the railfan community. The livery was introduced on 5 May 2004 when Toll Rail took over the rail system from Tranz Rail and replaced the Bumble-Bee livery. The livery was replaced by the KiwiRail Phase One livery in July 2008. DX 5379 was the first locomotive to wear the livery. The livery represents the colours of Toll Rail and the colours of Australia. When KiwiRail took over the rail system from Toll, the Toll logos on the locomotives were covered or "patched" with the KiwiRail logo.