The difference between Railcar and Rolling stock
When used as nouns, railcar means a self-propelled railway vehicle for passengers, whereas rolling stock means all vehicles that move on a railway, powered or unpowered.
check bellow for the other definitions of Railcar and Rolling stock
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Railcar as a noun:
A self-propelled railway vehicle for passengers.
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Railcar as a noun:
Any railway carriage or wagon, a railway car.
Examples:
"The Morristown & Erie Railway can even arrange to unload railcars for customers at this location."
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Rolling stock as a noun (railroads, uncountable, collectively):
All vehicles that move on a railway, powered or unpowered.
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Rolling stock as a noun (countable, less common):
Any such vehicle.