What is the question here?
Simple sentence it has a subject and a verb train being the subject and traveling being the verb fast being the adjective.
With fifteen different narratives in the form of stream<span> of consciousness, the reader of As I Lay Dying understands that there are fifteen different realities--no absolutes. </span>
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The sentence using the correct capitalization is the third:
"The Red Cross is a liaison for the families of soldiers stationed in other countries, acting as a go-between for separated spouses, parents and children."
Neither <em>liaison</em> nor <em>soldiers</em> need to be capitalized, since they are only common nouns, while the <em>Red Cross</em> is the proper noun of an institution and as such, it needs to have each word capitalized.