This video from Practical Engineering offers a brief explanation of dozens of different types of railcars, from passenger train cars like the dining car & sleeper car to freight cars like the boxcar, tank car, and hopper cars (for hauling things like sand or grain) to specialized cars the rail companies use to build and maintain their routes like rail grinders, snowplows, and track geometry cars.
Trains are one of the most fascinating engineered systems in the world, and they're out there, right in the open for anyone to have a look! Once you start paying attention, its pretty satisfying to look for all the different types of railcars that show up on the tracks.
They even made a little checklist to use for your beginner trainspotting. (via the kid should see this)
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