The difference between Multiple unit and Rolling stock
When used as nouns, multiple unit means a train consisting of one or more self-propelled cars capable of coupling with other units of the same or similar type and still being controlled from one cab, whereas rolling stock means all vehicles that move on a railway, powered or unpowered.
check bellow for the other definitions of Multiple unit and Rolling stock
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Multiple unit as a noun (rail transport):
A train consisting of one or more self-propelled cars capable of coupling with other units of the same or similar type and still being controlled from one cab.
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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.