Bumble-Bee was an informal term, promoted by the editors of NZ Railfan magazine, describing a New Zealand railway locomotive livery (resulting from the combination of black and yellow in the colour scheme) found in common usage amongst the railfan community. The livery, first introduced in May 2001 to promote level crossing safety to replace the Cato Blue livery and was initially trialed on Tranz Rail locomotive DC 4323, and over time was applied to numerous other locomotive classes up until 5 May 2004, when Toll Rail took over the rail system, and introduced the Corn-Cob livery. The first four locomotives that were painted in the livery, including DC 4323 and DFT 7160, received the livery with the Tranz Rail "winged" logo. DC4185, DX5166 and EF30071 never received branding when they were repainted in the livery. DC4185 did not receive branding either when it was repainted, but the sloping block letters were later applied to the loco. As of July 2020, only one DC, one DSC and three EFs still operate in this livery. Variations A few locomotives had been repainted in variations of this livery: DSC 2678 was repainted in the livery, but with a red stripe running down the sides of its hoods, which are the colours of Canterbury. DSG 3251 was repainted in the Otago colours of blue and yellow instead of black and yellow, with "TR" block letters on the logo hood, and a bumble-bee version of the Tranz Rail winged logo on the cab. TR 874 was repainted in this livery, but in reverse with a black cab and yellow hoods, with a bumble-bee version of the Tranz Rail winged logo also painted on the long hood. This variation was called by many rail enthusiasts as the "Wasp" livery. Although not an official variation, DCs 4421 and 4853 have received KiwiRail stickers on the front of the short-hood, and back of the long-hood. Locomotives that wore/wear the Bumble Bee livery DC class: 4012 - now in the KiwiRail Bold livery 4058 - now in the KiwiRail Bold livery 4185 - now stored at Hutt Workshops 4300 - now scrapped 4317 - now scrapped 4323 - now in the KiwiRail Bold livery 4398 - now scrapped 4421 - now stored at Hutt Workshops, Lower Hutt 4438 - now stored at Hillside Workshops 4450 - repainted in the KiwiRail Bold livery and now scrapped 4473 - now stored