No, the word "train" is not an adverb.The word "train" is a verb and a noun.
"By" can be an adverb, as in "We watched the train go by." "By" can also be a preposition, as in "We stayed in a cottage by the sea."
"Overnight" can function as an adverb or an adjective.
What is the adverb in this sentence the train left promptly ay 642 p.m?
The adverb is the word "earlier."
The adverb is "steadily", as it modifies the verb "rode".
Speeding is an adjective. It describes the noun train.
It's "promptly" to describe how the train leave
Across the country
The word slowly is already an adverb.An example sentence is: "he slowly brought the train to a stop at the platform".
No, it is not an adverb. It is a past tense and past participle. It can form participial phrases that are adjectives (e.g. the train operated by a freight company)
The word quickly is an adverb, a word that modifies a verb; for example:We quickly gathered our things when we saw the train approach.