Definition

A 19th-century British Railways safety protocol requiring locomotive drivers to alert the signalman when stopped on a mainline, preventing catastrophic collisions. It's the kind of boring but crucial rule that certain Thomas the Tank Engine episodes somehow forgot to follow.

Example Usage

The episode would've been more realistic if Henry's driver had actually obeyed Rule 55 before stopping on the tracks.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Rule%2055&defid=17910560)

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