tube train

noun

A smaller-profile underground train which operates through the tube tunnels under London, which have a small cross section.

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Meanings

nountube train (plural tube trains)

plural tube trains

  1. UKrail transportA smaller-profile underground train which operates through the tube tunnels under London, which have a small cross section.

    I took a tube train through the subway systems / I rode those tunnels like a six-foot mole

    1979, The Boomtown Rats, “Wind Chill Factor (Minus Zero)”, in The Fine Art of Surfacing

Origin

Probably named after the shape of the tunnels; the Tube is an informal name for London Underground which has been trademarked.

Full word history & related roots →
Cite this entry
APA

tube train. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/tube%20train

MLA

“tube train.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/tube%20train. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “tube train,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/tube%20train.

Source: tube train on Wiktionary, CC BY-SA 4.0.