A relative clause is adjectival.
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Amir Oghlow"What she did " is either a noun clause or a fused relative clause, isn't it?Both. There are many different names used to describe such clauses.
Amir OghlowI'd like to know when the train arrives."when the train arrives" is an indirect question; it is the complement of the verb "know".
Amir OghlowIs it correct?Yes.