The Boston Hub: South Station, Logan, and the Northeast Corridor in 2026

Boston is the smallest of the three Northeast Corridor anchor cities by passenger volume, the most architecturally distinctive of the three by station and terminal infrastructure, and the most operationally interesting of the three for the way the corridor’s premium-cabin product hands off between rail at South Station, BRT through the Ted Williams Tunnel, and international air at Logan’s Terminal E. I cover the corridor’s northern third from a base in Back Bay and have run the Boston-to-NYC Acela weekly for several years on the BCJ travel desk. The piece that follows is a structural look at the Boston hub — South Station and Back Bay on the rail side, the SL1 Silver Line on the ground transfer side, and Logan Terminal E on the international air side — for travelers who are anchoring more of their corridor work on the Boston end in 2026 than they were a few years ago.

The Boston hub is in better operational shape in 2026 than it was at any point in the post-2020 cycle. The Terminal E modernization at Logan completed in April 2024 and the post-completion operational baseline has held cleanly through 2025 and into 2026. The Silver Line’s subway-and-tunnel routing from South Station to the Logan terminals runs at a 15-minute baseline transit time and remains structurally the fastest public transit option between downtown Boston and the airport. The Acela operating posture at South Station and Back Bay holds at the post-Avelia-Liberty baseline as the new trainsets entered passenger service in late 2025 and through 2026, and Back Bay is in a multi-year renovation that runs through spring 2027 covering fare gates, circulation, and air quality.

This is the structural look at the hub — the three pieces of corridor infrastructure that the premium business traveler actually touches, and how they fit together.

Logan: the terminal map in 2026

Logan International Airport (BOS) operates four passenger terminals — A, B, C, and E — with a fifth, Terminal D, never having existed as a separate facility (the airport’s terminal layout skips the letter). The terminals run roughly in a curved arc on the airport’s land side, with Terminal A on the south end of the arc, Terminals B and C in the middle, and Terminal E on the north end of the arc closest to Boston Harbor.

Terminal A is the Delta Air Lines terminal at Boston Logan. Delta operates from Terminal A and Delta is the single dominant carrier in the terminal; the Delta domestic flow at BOS runs through Terminal A as the primary base.

Terminal B is the legacy multi-carrier domestic terminal serving American Airlines, United Airlines, Alaska Airlines, Southwest, Spirit, Air Canada, and Boutique Air. Terminal B has been a heavily-used multi-carrier terminal at BOS for decades and serves the carriers that have not had dedicated terminal allocations through the Massport modernization cycle.

Terminal C is the JetBlue Airways terminal. JetBlue is the single largest carrier at BOS by passenger volume — the airline has built BOS into one of its largest focus cities over the past two decades — and Terminal C was designed around JetBlue’s operational footprint. Aer Lingus, Etihad Airways, TAP Air Portugal, and Cape Air also operate from Terminal C. Massport has Terminal C upgrades scheduled for 2026 including a larger Gate C10 hold room, a modernized security checkpoint, and refreshed restrooms. A JetBlue Lounge is expected to open at Terminal C in 2026 — the first dedicated lounge inside Terminal C, which has been a notable gap in the terminal’s premium-passenger offering against the international terminals.

Terminal E is the international terminal at Boston Logan and is the most important single piece of new infrastructure at the airport for premium business travelers. Terminal E serves British Airways, Lufthansa, Emirates, Qatar Airways, and the broader long-haul international carrier set at BOS. The Terminal E modernization completed in April 2024 after a phased opening that ran from August 2023 (soft opening) through October 2023 (grand opening ceremony) into the April 2024 full-operational milestone. The $640 million project expanded the international terminal to approximately 390,000 square feet of total space — adding four additional gates to the terminal’s gate inventory — and added a Delta Sky Club inside the terminal as the dominant lounge product.

The architectural identity of the modernized Terminal E is the prismatic red roof. The Boston Globe’s coverage of the opening compared the terminal to a “ruby-red intergalactic spaceship” for the way the roof’s red panels subtly shift color depending on the time of day and the angle of sunlight. The architectural treatment runs across the terminal’s land-side facade and is visible to passengers approaching the terminal by car on the airport’s terminal-loop roadway.

The operational treatment is the four added gates and the expanded passenger flow capacity. The pre-modernization Terminal E had been the structural bottleneck for international growth at BOS — Massport’s traffic data through the late 2010s showed the international flow consistently bumping against the terminal’s capacity ceiling at peak hours. The four added gates lifted the ceiling materially, and the post-2024 operational baseline at Terminal E carries the long-haul flow without the chronic peak-hour pressure that had defined the pre-modernization terminal.

A separate $450 million parking expansion at Terminal E, led by Skanska USA, broke ground subsequent to the terminal modernization opening and is scheduled to complete in 2028. The expansion adds approximately 4,000 parking spaces in a new multi-story garage at Terminal E, with dedicated ground transportation areas on the lower level, a vehicular bridge to the existing central parking complex, and a pedestrian bridge connecting the new garage directly to the terminal. The expansion runs under Massport’s broader Logan modernization program and is the next major infrastructure milestone after the Terminal E completion.

For business class flyers, the practical Terminal E posture in 2026 is that the long-haul European and Middle Eastern departures run cleanly through the modernized terminal, the lounge product is the Delta Sky Club for SkyTeam Elite Plus passengers and the British Airways Galleries Lounge for oneworld passengers, and the terminal’s design supports a 90-to-105-minute pre-departure window comfortably for the long-haul carrier set. The Lufthansa Senator Lounge at Terminal E covers the Star Alliance long-haul flow.

South Station: the rail terminus

South Station sits at the eastern end of Atlantic Avenue in downtown Boston, at the corner of Atlantic and Summer Street, and is the southern terminus of the Northeast Corridor. The station handles Amtrak Acela Express and Northeast Regional service on the corridor, the Amtrak Lake Shore Limited overnight train to Chicago, all MBTA commuter rail lines on the south side of the network (Providence/Stoughton, Franklin/Foxboro, Needham, Greenbush, Kingston, Middleborough/Lakeville, Fairmount, and Worcester/Framingham), and the MBTA Red Line subway and Silver Line BRT on the underground transit level.

The Amtrak terminus posture at South Station is the corridor’s northern end. Acela Express trains terminate at South Station; there is no through-routing past Boston on the Acela product. Northeast Regional trains terminate at South Station except for the Lake Shore Limited routing that proceeds west toward Albany and Chicago through the Boston-Albany sector. The corridor’s track infrastructure at South Station is a stub terminal arrangement with the platform structure running west-to-east on the Atlantic Avenue alignment.

Acela First Class passengers at South Station have access to the Acela Lounge inside the station’s main concourse. The lounge product at BOS is operationally similar to the Metropolitan Lounge at Moynihan Train Hall in New York, with a coffee and snack service, a waiting area, and direct boarding access to the Acela gates. The lounge sits on the main concourse level under the South Station head house.

The South Station head house — the granite-fronted Beaux-Arts structure on Atlantic Avenue — has been the visual identity of South Station since the building’s original 1899 construction. The interior concourse has been progressively modernized through the past two decades while the head house’s exterior remains the historic preservation centerpiece of the station. The retail and dining concourse inside the head house runs the standard major-station mix — coffee and casual dining for passengers, a CVS and other retail tenants for the commuter flow, and the Acela Lounge for First Class passengers.

The SL1 Silver Line bus rapid transit to Logan Airport boards from the South Station bus terminal on the underground transit level, accessed via the main concourse. The Silver Line connection is the single most important ground transfer at South Station for the premium business traveler — it connects the rail corridor’s northern terminus directly to the airport’s terminal flow without requiring a taxi or rideshare. The SL1 connection is covered in the Silver Line section below.

Back Bay: the secondary Acela station

Back Bay station sits at the corner of Dartmouth Street and Stuart Street in the Back Bay neighborhood, between Copley Place and the Prudential Center, and is the secondary Acela and Northeast Regional stop on the Boston end of the corridor. All Amtrak Acela Express and Northeast Regional trains running to and from South Station stop at Back Bay. The station also handles three MBTA commuter rail lines on the south side of the network — the Providence/Stoughton Line, the Franklin/Foxboro Line, and the Needham Line — and connects to the MBTA Orange Line subway.

Back Bay has five tracks serving Amtrak and commuter rail service. Tracks 1, 2, and 3 carry Amtrak’s Acela Express and Northeast Regional plus the MBTA’s Providence/Stoughton, Franklin/Foxboro, and Needham lines. The track configuration supports a high-frequency operation on a relatively compact station footprint.

The practical choice between South Station and Back Bay for Acela passengers is destination geography. Back Bay is the closer station for destinations in the Back Bay neighborhood proper, around Copley Square and the Boston Public Library, along Newbury Street, in the Prudential Center and Hynes Convention Center area, on Beacon Hill, and in the Fenway. South Station is the closer station for the Financial District (especially the State Street, Federal Street, and Pearl Street office cluster), the Seaport District (Innovation District, Waterfront, and the office towers around the convention center), Downtown Crossing, and the North End. For the broader Boston-area business district, the right choice between the two stations runs roughly fifty-fifty depending on the specific destination.

The MBTA is in a multi-year renovation at Back Bay that runs through spring 2027. The scope covers circulation improvements through the station — easier pedestrian flow from the platforms to the concourse and from the concourse to the Dartmouth Street and Stuart Street exits — exterior building work, and air quality improvements addressing the long-standing problems with the underground station’s ventilation system. The MBTA is also installing fare gates at the Back Bay commuter rail and Amtrak platforms in early 2026 under the broader fare gate rollout across the MBTA commuter rail network.

For corridor passengers in 2026 the practical effect of the Back Bay renovation is occasional construction-related friction during the work — the circulation improvements involve sections of the station being temporarily reconfigured — but the station continues to operate normally for Acela and Northeast Regional service throughout. The renovation’s completion in spring 2027 will give the Boston end of the corridor a meaningfully modernized secondary station against the South Station head-end terminus.

The Silver Line SL1: the South Station-to-Logan BRT

The Silver Line is the MBTA’s bus rapid transit system, operating six routes (SL1, SL2, SL3, SL4, SL5, and SLW) above- and below-ground. The SL1 is the Logan Airport route and is the single most important transit connection at Boston Logan for premium business travelers using the corridor.

The SL1 routing runs from South Station’s underground bus terminal westbound (the layout-direction is westbound through the Silver Line tunnel even though the geographic direction is generally eastward toward the airport) through a dedicated subway tunnel under downtown Boston to the World Trade Center station in the Seaport District. The tunnel routing continues to the Silver Line Way surface station at the eastern end of the Seaport, where the route emerges to the surface and continues on public roads into the Ted Williams Tunnel under Boston Harbor to Logan Airport.

At Logan the SL1 loops around the airport’s terminal complex with arrivals-level stops at Terminal A, Terminal B (two stops, one at each end of Terminal B due to the terminal’s length), Terminal C, and Terminal E. The full loop covers all four terminals on a single inbound (Logan-to-South-Station) run.

The transit time from South Station to the airport runs as short as 15 minutes under clean conditions, and the route runs at a high frequency throughout the day. The 15-minute transit time is competitive with any taxi or rideshare option on the same routing — the Ted Williams Tunnel routing is the fastest connection between downtown Boston and the airport regardless of mode, and the SL1’s dedicated tunnel-and-roadway routing matches what a private vehicle covers on the same alignment.

The fare structure is the most attractive single operational feature of the SL1 for the airport connection. Inbound (Logan-to-South-Station) fares are free when boarding at the Logan airport stops — Massport subsidizes the inbound fare under a longstanding agreement with the MBTA. The arrangement is the cleanest free-airport-transit setup of any major US airport. The outbound (South-Station-to-Logan) fare runs at the MBTA’s standard local bus fare. The SL1 connects to the MBTA Red Line at South Station as a free transfer for passengers using the Red Line into the broader downtown subway network.

For Acela passengers terminating at South Station with an international departure from Logan Terminal E, the SL1 connection is the canonical ground transfer routing. A typical southbound Acela arrival at South Station at noon, plus a 15-minute Silver Line ride to Terminal E for a 2:30 p.m. international departure, runs cleanly with comfortable buffer. The same routing for a Terminal C JetBlue departure or a Terminal A Delta departure runs at the same transit time on the SL1 loop.

The Silver Line below-ground accessibility through the South Station bus terminal and the Logan terminal stops is the cleanest accessible-airport-transit infrastructure I have used in any US city for the premium-cabin business flow. The wheelchair-accessibility design of the SL1 buses and the underground bus terminal at South Station is materially better than any equivalent setup at LGA, EWR, or DCA, and the published MBTA accessibility data backs that observation.

The Acela schedule at Boston

The corridor’s Boston schedule runs at a published 3:30-to-3:45 South-Station-to-Penn-Station window on Acela Express, with Northeast Regional running at a published 4:15-to-4:45 window on the same city pair. The schedule reflects the structural track and signal infrastructure between New Haven and Boston, which is the slowest section of the Acela route and carries the largest single performance variable on the Boston end of the corridor.

The 3:30-to-3:45 Acela schedule has held substantially unchanged for years. The Avelia Liberty trainsets that Alstom delivered to Amtrak in August 2025 and that entered passenger service through fall 2025 and 2026 — replacing the legacy Bombardier Acela Express trainsets that have run the corridor since 2000 — do not change the published Boston-to-NYC schedule on the track infrastructure available in 2026. The Avelia Liberty’s active tilt system supports higher speeds on curved track segments, but the Boston-end track itself does not support meaningfully higher schedule speeds without a multi-year infrastructure investment that the FRA’s published corridor improvement plan targets for the latter half of the 2020s.

The FRA has funded a series of Connecticut and Rhode Island corridor improvement projects on the Boston-end track, including curve-modification work near Old Saybrook, Connecticut and signal-and-power work on the Rhode Island sector. The Connecticut and Rhode Island work is the structural intervention that will lift the Boston-to-NYC schedule once it completes, and the published target is a sub-three-hour Boston-to-NYC Acela schedule on the next-generation track infrastructure. That target is the long-run signal on the corridor’s Boston end; the 2026 reality holds at the 3:30-to-3:45 published schedule.

The Boston-to-Washington Acela schedule runs at a published 6:30-to-7:00 window through Penn Station and is the through-route that serves the secondary Acela traffic into the federal capital from Boston. The Boston-to-Washington run is a long single sit, and the schedule’s appeal is structurally limited against the air-side products on the same city pair — JetBlue Mint between BOS and DCA runs at a 1:30 in-cabin time on the same corridor, plus airport ground, and the door-to-door clock favors the air for Boston-Washington engagements where the rail’s continuous-cabin advantage does not carry the day. The Acela’s Boston-to-DC product holds its niche on the Connecticut and New York stops along the route — for business travelers with a Wilmington, Baltimore, or Philadelphia stop on the routing, the Acela through-run is competitive against a multi-leg air arrangement.

The Acela’s morning peak runs heaviest southbound out of Boston with the South Station-to-Penn-Station business pattern dominating, and the afternoon and evening peak runs heaviest northbound into Boston as the southbound passengers return. The First Class load on the Boston end is consistently lighter than the New York and Washington ends of the corridor — the Boston-to-NYC City Pair Acela First Class flow is a meaningful share of the corridor’s First Class revenue but the Boston-to-DC Acela First Class flow is structurally thinner than the NYC-to-DC counterpart.

Logan’s lounge map for premium passengers

The lounge map at Logan for premium business class passengers has tightened meaningfully since the Terminal E modernization completion. The relevant lounges by terminal:

Terminal A: Delta Sky Club for Delta One, Delta Premium Select, and Delta SkyMiles Reserve cardholders. The Sky Club at Terminal A is the dominant lounge for the Delta domestic flow at BOS.

Terminal B: The Admirals Club is American Airlines’ lounge in Terminal B, accessible to American Flagship and Admirals Club members. The United Club at Terminal B serves the United Polaris and United Club passengers.

Terminal C: This is the gap in the BOS lounge map. JetBlue, the dominant carrier at Terminal C, has historically not operated a dedicated lounge at BOS. A JetBlue Lounge is expected to open in 2026 as part of the broader Terminal C upgrades, which will close the gap. Aer Lingus passengers use a contracted lounge product at Terminal C; the international flow at Terminal C is structurally thinner than at Terminal E.

Terminal E: The Delta Sky Club at Terminal E is the dominant lounge product in the modernized terminal. The British Airways Galleries Lounge serves the oneworld international flow. The Lufthansa Senator Lounge covers the Star Alliance long-haul flow. The Terminal E lounges are the most important single set of premium-cabin amenities at the airport.

For business class passengers connecting from Acela arrival at South Station to an international departure at Terminal E, the practical pre-flight routing in 2026 is the Silver Line SL1 to Terminal E, followed by check-in at the relevant carrier desk, security, and the carrier-appropriate lounge. The 15-minute SL1 transit time plus a 30-minute pre-security buffer plus a 60-to-90-minute pre-departure lounge window covers the long-haul departure cleanly.

The corridor’s Boston posture: who books from here

The Boston end of the corridor handles a specific premium-traveler population. The Boston-based legal practice on the Northeast Corridor — Wilmer, Ropes & Gray, Goodwin, Skadden’s Boston office, the major firms in the Financial District — runs a regular Boston-to-NYC Acela cycle on partner-and-senior-associate work. The Boston-based asset management industry — Fidelity, State Street, Wellington, Eaton Vance — runs a heavier Boston-to-NYC pattern on the institutional investor cycle. The biotech and life sciences cluster around Kendall Square and the Cambridge Innovation Center runs a structured Boston-to-NYC-to-DC pattern on FDA, regulatory, and capital-markets engagements. The Boston-based university and health-system administrative class — Harvard, MIT, BU, Northeastern, Mass General, Brigham — runs a regular Acela pattern on policy and federal-funding engagements.

The volume mix puts Boston-to-NYC at the heaviest single corridor city pair for the Boston traveler population, with Boston-to-Washington as the secondary corridor. The Boston-to-Philadelphia and Boston-to-Wilmington patterns are thinner but structurally important for the legal practice’s IP and Delaware-corporate-counsel work. The Boston-to-Newark and Boston-to-EWR-airport patterns serve the cluster of business travelers who anchor on JFK or EWR for transatlantic departures and need to position into NYC’s New Jersey-side airports rather than LGA.

The Acela’s Boston First Class product holds its market share on the Boston-to-NYC city pair against JetBlue’s Mint product on the same corridor — Mint is the JetBlue lie-flat product on the A321LR running between BOS and JFK and is competitive on door-to-door times and on the in-cabin experience. The Acela’s structural advantage over Mint on the corridor is the continuous-cabin work environment on the 3:30-to-3:45 run versus the air product’s airport-to-airport handling overhead; the air product’s structural advantage is the shorter in-cabin time and the JFK terminal connection for onward international departures. For the Boston-to-NYC same-day return engagement the Acela is the canonical choice; for the Boston-to-NYC-onward-to-international engagement the Mint product is structurally more useful.

What the Boston hub looks like in 2027 and beyond

The Boston hub’s 2027-and-beyond posture turns on two milestones. The first is the Back Bay station renovation completion in spring 2027, which will give the corridor’s secondary Boston station the modernization that the Beacon Hill, Back Bay, and Copley Square destination flow has wanted for years. The completion will likely shift a modest share of the Boston Acela load from South Station to Back Bay, since the renovation’s circulation improvements and air quality work will make Back Bay materially more pleasant as a station environment.

The second is the FRA’s Connecticut and Rhode Island corridor improvement work that targets the Boston-end track infrastructure. The next-generation track work is a multi-year program with completion phases running through the latter half of the 2020s; the long-run target is a sub-three-hour Boston-to-NYC Acela schedule. That target will be a meaningful step-change for the corridor when it lands, materially improving the Boston-to-NYC value proposition against both JetBlue Mint on the same city pair and against the LaGuardia and Newark shuttle products. The track infrastructure timeline is the structural variable that governs the Boston end’s long-run schedule, and the FRA’s investment posture through 2026 supports the timeline holding.

The Logan terminal infrastructure runs ahead of the rail infrastructure in delivery posture. The Terminal E modernization completed in 2024; the Skanska parking expansion targets 2028; the Terminal C upgrades and JetBlue Lounge opening run through 2026. The airport’s premium-cabin infrastructure will be substantially more capable in 2028 than it was at any point in the past decade.

The Silver Line SL1 holds at the current operational baseline through the period — the BRT routing through the Ted Williams Tunnel does not need significant infrastructure investment to support the airport connection’s growth, and the inbound free-fare arrangement is stable under the MBTA-Massport agreement. The Silver Line’s role as the airport connection is structural and durable.

The Boston hub is the corridor’s most operationally clean anchor in 2026. The rail-to-air handoff at South Station-to-Terminal E via the SL1 is the cleanest equivalent at any of the corridor’s three anchors. The premium-cabin infrastructure on both the rail and air sides is in better shape than it has been at any point in the past decade. The corridor’s Boston posture is the part of the Northeast Corridor that travelers should be anchoring more of their work on, not less.

Frequently Asked Questions

Which Logan terminal do I use for international business class?

Terminal E. The $640 million Terminal E modernization fully opened in April 2024 after a soft opening in August 2023 and a grand opening ceremony in October 2023, expanding the airport’s international terminal to roughly 390,000 square feet with four additional gates added, plus a Delta Sky Club inside the terminal. British Airways, Lufthansa, Emirates, Qatar Airways, and the other long-haul international carriers operate from Terminal E. The terminal’s prismatic red roof is the visual signature of the modernization and runs the public-art identity of the project; the operational identity is the four added gates and the expanded passenger flow on the international side. A separate $450 million parking expansion led by Skanska USA broke ground subsequent to the terminal opening and is scheduled to complete in 2028, adding approximately 4,000 spaces in a new multi-story garage tied to Terminal E with a pedestrian bridge connection.

What is the Silver Line and how does it run from South Station to Logan?

The Silver Line is the MBTA’s bus rapid transit system in Boston — six routes (SL1 through SL5 and SLW) operating above- and below-ground. The SL1 is the Logan Airport route, connecting South Station in downtown Boston to all four Logan terminals (A, B, C, and E) at the airport’s arrivals level, with two separate stops at Terminal B due to its length. The route runs in a dedicated subway tunnel under downtown Boston from South Station to the World Trade Center, emerges at Silver Line Way in the Seaport District, then continues to the airport on public roads including the Ted Williams Tunnel under Boston Harbor. Transit time from South Station to the airport runs as short as 15 minutes under clean conditions. Fares are free in the inbound (Logan to South Station) direction when boarding at the airport — Massport subsidizes the inbound fare under a longstanding agreement. The SL1 connects to the Red Line at South Station as a free transfer.

What is the Acela operating posture at South Station and Back Bay?

All Amtrak Acela Express and Northeast Regional trains running to and from Boston serve both South Station and Back Bay. South Station is the corridor terminus at the eastern end of Atlantic Avenue downtown; Back Bay sits roughly five minutes earlier on the corridor in the Back Bay neighborhood at Dartmouth Street and Stuart Street, between Copley Place and the Prudential Center. Back Bay has five tracks serving Amtrak and commuter rail, with Tracks 1, 2, and 3 carrying Acela Express, Northeast Regional, and the MBTA’s Providence/Stoughton, Franklin/Foxboro and Needham lines. The practical choice between the two stations for the corridor is destination geography — Back Bay is the closer station for the Back Bay, Copley, Prudential, Newbury Street, and Beacon Hill destinations, and South Station is the closer station for the Financial District, Seaport, and Downtown Crossing destinations. The MBTA is installing fare gates at Back Bay in early 2026, and a multi-year renovation at Back Bay runs through spring 2027 covering circulation improvements, the building’s exterior, and the air quality system.

Where does the Boston corridor fit into the broader Northeast Corridor?

Boston is the northern anchor of the Northeast Corridor and the corridor’s smallest hub by passenger volume but the most important hub by city-pair density for premium-cabin and Acela First travelers. The Boston-to-New York Acela corridor runs at a published 3:30-to-3:45 schedule from South Station to Penn Station and is the canonical northern Acela run; the Boston-to-Washington corridor runs at a published 6:30-to-7:00 schedule and is the through-route that serves the secondary Acela traffic into the federal capital from Boston. South Station’s Acela departure pattern runs through the day with the morning peak running heaviest southbound and the afternoon and evening peak running heaviest northbound. The corridor’s track and signal infrastructure between New Haven and Boston is the slowest section of the entire Acela route and carries the Boston-to-NYC schedule’s largest single performance variable; the FRA has funded a series of Connecticut and Rhode Island corridor improvement projects to lift the schedule on the Boston end, but the structural schedule has held at the 3:30-to-3:45 range for years.

Related on the journal. Acela vs Car Service NYC-DC: A 2026 Case Study · Best Car Service NYC to Washington DC (2026): A Premium Reviewer’s Acela-vs-Sedan Corridor Ranking · JFK to London Heathrow in 2026: All Six Business Class Products, Ranked and Reviewed · Best Car Service NYC to Boston (2026): A Premium Reviewer’s Acela-vs-Car Ranking