The moderately-effective pro-passenger-rail lobbying organizations are mostly state-level and lobby for state-specific improvements.
Lobbying Congress has been highly ineffective for a long time, and even more ineffective in the last decade or two. There is something seriously wrong with the federal government right now. The states have problems too but they seem more pliable.
Jis believes that we can get a couple of small changes through Congress to restore the teeth in Amtrak's ability to force the freight railroads to obey the law on passenger priority, largely because this amounts to restoring the intended meaning of a law which was overturned by an activist, precedent-ignoring right-wing judge.