Maybe if Amtrak management would have acted to improve their woeful F&B, Congress would not have had to step in with a directive.
That's two levels of failure before it gets to Congress. Amtrak executive management and Amtrak's Board.
I don't think it is too much to ask that Amtrak management actually make decisions within a timeframe of years without Congressional directives. But it seems like it is.
As
@jis said, "potted plants".
As to the "committee deliverables", to quote Robert Heinlein, "A committee is the only known form of life with 10 stomachs and no brain."
Committees, congressionally directed or no, are no substitute for competent, knowledgeable, and decisive management. They are wonderful for poor management to hide behind, though.