Thomas and his fellow Tank Engines prove that steam transportation is not as obsolete as we assumed.
George Carlin narrated the third and fourth seasons of "Thomas the Tank Engine and Friends" for American audiences; he also re-narrated the first and second seasons, and played Mr. Conductor in "Shining Time Station" and "Mr Conductor's Thomas Tales".
After narrating the fourth season, Carlin left the series to do several comedy specials and pursue other projects.
From Season 1, Episode 22.