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train spotter

British  

noun

  1. a person who collects the numbers of railway locomotives

  2. informal a person who is obsessed with trivial details, esp of a subject generally considered uninteresting

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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If you’re a train spotter, you’re going to hate it, because it’s not in the timeline, but whatever.

From New York Times May 27, 2022

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