From what I have seen on the interwebs, and speaking with 1 person from Puerto Rico, not many passengers have covered the rail line either. The person from Puerto Rico I asked said the problem is it doesn't go anywhere people want to travel. Does anyone have info to confirm or refute this?
As for no English web info being unfair since VIA rail Canada has both French and English Versions of there web page, I believe Canada's constitution says French and English are official languages and there may be specific laws that mandate many things be in French and English. The United States on the other hand has no official language, and any English-Spanish bilinguality is probably not legally required.
http://www.usconstitution.net/consttop_lang.html
No official language is mentioned or contemplated in the Constitution.
Many people are surprised to learn that the United States has no official language. As one of the major centers of commerce and trade, and a major English-speaking country, many assume that English is the country's official language. But despite efforts over the years, the United States has no official language.
Almost every session of Congress, an amendment to the Constitution is proposed in Congress to adopt English as the official language of the United States. Other efforts have attempted to take the easier route of changing the U.S. Code to make English the official language. As of this writing, the efforts have not been successful.