Supertrain was a television drama/adventure series that ran on NBC from February 7, 1979 to May 5, 1979. It took place on the Supertrain, a nuclear-powered bullet train that was equipped with amenities more appropriate to a cruise ship than a train, such as swimming pools and shopping centers; indeed, it was so big it had to run on two sets of track. Much like its contemporary The Love Boat, the plots concerned the passengers' social lives, usually with multiple intertwining storylines, and most of the cast was composed of guest stars. The production was elaborate, with huge sets and a high-tech model train for outside shots.

At the time, Supertrain was the most expensive series ever aired in the United States. The production was beset by problems, including a model train that crashed, and while it was heavily advertised during the 1978-1979 season, it suffered from bad reviews and low viewership; despite attempts to salvage the show by reworking the cast, it never took off and left the air after only three months. NBC was never able to make up the production losses (it produced the show itself, with help from Dark Shadows producer Dan Curtis at first), and combined with the US boycott of the 1980 Summer Olympics the next season (which cost NBC millions in ad revenue), it nearly bankrupted the network. For these reasons, Supertrain is usually cited as the worst television flop ever.

Nine episodes were made, including a 2-hour pilot episode.