At one point during production, Canadian-based distributor Fremantle Corporation was involved in the distribution. The BBC was due to start broadcasting the show in 2005, but the BBC delayed it out of sensitivity after the
July 7th bombings of that year.
Design All the visuals for the show are produced using
computer-generated imagery, and the cost of production was high. The first series was produced using
LightWave 3D software.[https://web.archive.org/web/20070515155044/http://www.joellaproductions.com/News.aspx?CF=News&NewsID=6 Some critics have pointed out the similarities between
Underground Ernie and
Thomas the Tank Engine and Friends, in that both series feature anthropomorphic locomotives. Whilst acknowledging a similarity, the
producers make it clear that this is very different from
Thomas, and is very much based in the twenty first century. Despite being underground metro trains, they often travel overground through the open countryside to various stations beyond the city, including a
seaside resort. The overall design is inspired by the real London Underground, and
Transport for London has allowed the series to use design elements directly taken from their brand, in particular the use of their distinctive Underground logo, or 'roundel' as it is known. 3D Films (who previously animated another series called Wheels on the Bus) is responsible for the animation provided, even though both Joella Productions and 3D Films had a bad relationship during production. ==Characters==