Don't get discouraged from writing to or calling your congressperson just because some people aren't getting responsive answers to their emails, letters, etc.
Firstly, just because
some congresspeople are politically inclined against Amtrak or apathetic about it, and thus don't respond at all or give a vague and unresponsive reply, doesn't mean they all are. One of my senators has sent a responsive email to pretty much every email I've sent regarding Amtrak ... and most of the other issues I've written him about.
More importantly, I was told repeatedly by a non-profit lobbyist* that even legislators who don't personally care about a particular issue and don't send a responsive answer
do keep track of the sheer number messages they get on an issue, assigning some staffer to keep a tally of them. If they get enough, they presume for each constituent who bothers to write or call there must be more constituents who agree but don't bother. The lobbyist called it the cockroach theory: for each one you see, there must be hundreds you don't.
*Working for non-profits, he had to work the glad-hand and shoe-leather at the state capitol when the assembly was in session. No $ for bribes.