Crossword Genius

Joined by railway (3)

Ross

I believe the answer is:

met

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'joined' is the definition.
(meeting is a kind of joining)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for met that I've seen before include "gathered together" , "Encountered, came into contact" , "Came together, encountered" , "London police (abbr) - New York Museum of Art (abbr)" , "Encountered or touched" .)

I've seen this clue in the Evening Standard.
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