ontologyportal/sumo

Train is a collection?

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http://sigma.ontologyportal.org:8080/sigma/Browse.jsp?lang=PolishLanguage&kb=SUMO&term=Train

(documentation Train EnglishLanguage "Train is the subclass of TransportationDevicewhose instances are linked sequences of RollingStock.")

but

(subclass Train Collection)

??

Maybe it makes sense... Sorry for the confusion.