Tube railway

Also found in: Wikipedia.
Related to Tube railway: Tube Time

Tube rail´way electrically powered railroad with tracks running through a tunnel underground; a subway.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
(4) 'First Tube Railway. Jubilee of City and South London', The Times, 2 November 1940.
TUBE railway tracks were flooded by two million litres of water when a 100-year-old water main burst after earth around it moved during exploratory work.
Separate solutions to all three were brought together in London in the 1880s, making it possible to build the world's first deep-level electric Tube railway. It all makes for a masterful story of innovation, endeavour and dogged persistence.
At first this was occupied by a vendor of garden furniture; subsequently it was filled by a cast-iron canopy, various wooden shacks and cab shelters, and an entrance to the tube railways below, hiding the original open arcade of segmental arches.