This proposal, like the Union Station takeover in DC, isn't the same thing - LA wasn't a transfer of control of the station itself, as the Trumpers are apparently talking about here. The DC takeover was (relatively) pretty much legal because of DC's unique legal status and that the station was...
...already controlled by Amtrak, which is part of the federal govt. (Yes, it's technically a corporation, not a Federal agency, but that's a distinction without much difference.) Boston South Station is owned by the State of Massachusetts, so this would be a new and illegal escalation entirely.
I'm aware of the legal differences. The effect is the same: control of the population and public spaces.
I understand that, but my point is that the LA takeover was literally an (illegal, stupid, etc.) police action that would, presumably, eventually end, while the DC and proposed Boston actions are meant to be permanent. That's a major expansion of day-to-day Federal control over people's lives.
No one in LA presumes the ICE/NatGuard occupation will end unless we end it. That is a fantasy we cannot afford to indulge in.