rack-rail

Definition

Noun: A type of rail used in a rack railway system, featuring a toothed or cogged track that engages with a pinion on a locomotive to provide traction on steep gradients.

Usage Examples

• (The toothed rail allows the train to grip the track and ascend without slipping.)
• (The special rail is necessary for trains to travel up very steep slopes.)

Advanced Usage

• "rack-rail system": the complete infrastructure of toothed rails and matching pinions used for steep railway lines.
  • Switzerland is famous for its rack-rail systems in the Alps. (The country has many mountain railways that rely on this technology.)

Variants and Related Words

• Rack railway (n): a railway that uses a rack-rail for steep gradients.
  • The Pilatus Railway is the steepest rack railway in the world. (It uses a rack-rail to climb a maximum gradient of 48%.)
• Rack-and-pinion (adj): describing a mechanism where a toothed rack engages with a gear (pinion) to convert rotational motion into linear motion.
  • The rack-and-pinion steering system in a car is different from a rack-rail used in railways. (Both use a similar principle of teeth and gears but for different purposes.)

Synonyms

• Cog rail: a rail with teeth that mesh with a cogwheel on a locomotive.
• Toothed rail: a rail with a series of projections (teeth) designed for traction.

Related Idioms

• "On the rack-rail": metaphorically, to be in a situation requiring steady, step-by-step progress.
  • The project felt like it was on the rack-rail—slow but sure. (The work progressed methodically, one step at a time, like a train climbing a steep track.)