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Across the country
The adverb is "steadily", as it modifies the verb "rode".
No, the word "train" is not an adverb.The word "train" is a verb and a noun.
The prepositional phrase is by train.
An adverb clause is a group of words that functions as an adverb in a sentence. It typically includes a subject and a verb and provides information about when, where, why, or how an action is taking place. Adverb clauses can appear at the beginning, middle, or end of a sentence.
"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.
You can drive across the US, you can take a bus across the US, you can fly across the US, you can take the train across the US.
The adverb is the word "earlier."
I have been told by my freight forwarder that it means sending your container by train across country
At Amtrak.com you can book your train trip trip to any of it's destinations across the United States.
Trains were invented because there was a need for them. Trains were invented to carry heavy loads across land in the country.