Courthouse → Fan Pier: There are other major courthouses close to T stops, including the Suffolk County Superior Court (GC) and Suffolk Family and Probate (Haymarket) plus a number of district courts. "Fan Pier" is unique and better encapsulates the neighborhood.
Right, I somehow forgot about how bad Courthouse's name is. I'm also wondering about
Seaport Common, the name of an actual park nearby. The goal is more as an explicit mention of this being Seaport (and probably the most popular part of it), not because of the park's own notability. But ultimately, I do agree that Fan Pier sounds better.
Design Center → literally anything else. Technically it's "Design Center Place", but that's still confusing, since 23 Drydock and 27 Drydock are the stops that actually serve most of the building. There's a lot that needs rethought about the SL2 loop - the stops are substandard, the Cruiseport is poorly served, and the layovers awkwardly interrupt a lot of trips.
I'm almost wondering if all the necessary SL2 improvements should be tied together with more higher-level rethinking and redevelopment of Eastern Seaport itself. I'm not familiar with any further developments planned (and how much of a concern Logan's height restrictions are), but right now, this entire region feels like an afterthought, not just SL2 alone.
Boston Landing → Allston/Brighton: "Allston Yards" is too close to "Beacon Park Yard"; "Allston/Brighton" is better for the whole neighborhood it serves.
In context of the commuter rail system alone, this makes sense; but it feels awkward on a transit map when Allston is served by other lines more directly. I actually see this as part of the reason why Cambridge station on the Fitchburg line was renamed: even without it becoming a transfer station with RL, I would still add the "Cambridge" station to the rename list.
Same for the Chelsea → Mystic Mall item below, for any system map that also shows the 104/111/116 etc.
Arlington → Public Garden: mildly better for wayfinding, but the current name is fine
It may be fine for now, but the biggest problem comes in a (very realistic) future with RL extension to Arlington the town.
Broadway → Fort Point: Fort Point has always been centered more around Summer Street. If Summer Street gets a real busway, I'd use Fort Point for the stop near A Street.
While I agree that Fort Point should ideally be used for a Summer St station, from my perspective, it's more about renaming Broadway to
anything else. That name is about as general as Washington St is
(not to mention possible misconceptions from international tourists who may think that Broadway only refers to NYC's Theater District).
Other than Fort Point, I haven't thought of a good alternative. I even thought about calling it "Cabot" after Cabot Yard, but I doubt that's recognizable outside of transit nerds.
Eastern Avenue → Highland Park: Highland Park isn't a well-known destination, while Eastern Avenue is a major arterial. Also potentially confusing because Box District station is on Highland Street.
Highland Park is indeed not very notable, but ironically, "Eastern Avenue is a major arterial" was precisely why I felt renaming it was a good idea. Broadway @ Eastern Ave, near which the 116 makes stops, is a mile away from the SL3 station.
Although my current attempts are "Chelsea Creek" and "Chelsea Bridge", neither of which is any better.