Definition of "high-speed"

high-speed

adjective
comparative higher-speed, superlative highest-speed
1. That operates, moves or takes place at a greater than normal speed.
  Quotations
  Dead-man's handle, automatic train stop, quick-acting compressed-air brake specially suited for high-speed working, and regenerative braking are among the features of the new locomotives.
  1947 March and April, “Swiss High-Speed Electric Locomotives”, in Railway Magazine, page 94
  Less important lines of plain double track carrying a mixture of passenger and freight traffic cannot be given ultra-fast expresses, and where alternative routes exist, as for example between London and the West Riding, the specially high-speed trains must be restricted to one of them only.
  1960 February, “Talking of Trains”, in Trains Illustrated, page 67
  A “moving platform” scheme […] is more technologically ambitious than maglev trains even though it relies on conventional rails. […] This set-up solves several problems […]. Stopping high-speed trains wastes energy and time, so why not simply slow them down enough for a moving platform to pull alongside?
  2013 June 1, “Ideas coming down the track”, in The Economist, volume 407, number 8838, page 13 (Technology Quarterly)