Is there any way to expand the Harvard Square Busway to serve more routes? While it does a great job keeping certain busses off the street in Harvard Square, some of the T's heaviest ridership routes (#1 and #66 come to mind) still have to crawl though Harvard Square Traffic dozens of times a day. Let's fix that.
1: Turn the North Harvard Street bridge into a bus/light rail in the future/pedestrian/bicycle bridge. There should be plenty of room for one transit lane, one pedestrian lane, and one generously apportioned bike lane in each direction.
2: Pedestrianise JFK street all the way from Harvard Square to JFK park.
3: Open up the old red line tunnel, have it portal up in JFK park, connect it to the bus subway, route the 66 through it.
Okay, here's where things start to get crazy.
4: Turn the 66 into a trolleybus. With modern trolleybusses able to run off-wire for substantial portions of their route, we shouldn't have to build any extra DC substations.
5: Branch the bus subway off north of Harvard Square, so that busses can run directly to/from the Cambridge street underpass to/from the Harvard Bus Subway.
6: Add a balloon loop to the north side of the bus subway so that busses/light rail trains can loop.
For #1 and #3, consider those as potential stagings for the Urban Ring Harvard Branch. The setup is as follows. . .
The as-planned branch (as BRT or LRT) would fork off the UR mainline at bi-directional junction at BU Bridge and follow the last half-mile of the Grand Junction ROW to West Station. Thru routings possible from Kenmore or MIT/Lechmere via that bi-directional junction. Where the branch goes through Allston after West is all TBD as it is explicitly an I.O.U. from Harvard to reserve some sort of contiguous transit reservation through Beacon Park to provision for this. Where that actually lands is anyone's guess, but assume there will be some sort of straight shot from West to Cambridge St. to Western Ave. when all is said and done and buildings start infilling all that empty land. From Western there's open path on one block or another to slip behind the row of buildings hosting Harvard Innovation Lab and run alongside the border of the athletic fields to N. Harvard St. Assume this is doable with either an underpass/overpass of Cambridge St. (possibly recycling some of the bridge/embankment that remains after the existing Pike ramps are deleted) and probable overpass of Western, such that the line going BU Bridge<==>West<==>Cambridge St.<==>Western Ave. is either 100% grade separated or only has at-grade crossings on the low-traffic side streets partitioning Beacon Park on Harvard's TBD transit reservation.
Ideally you want to get right into Harvard Station under total separation, but that's going to require a new tunnel under the Charles River...which is way expensive. So say for starters you build the line to the foot of N. Harvard St., install a pocket track there for if-needed emergency turnbacks, and lay streetcar tracks on N. Harvard as an interim Phase 1 for covering the last half-mile into the Square. That's where your
#1 proposal could prove enormously useful for a 10-15 year span of starter service. Have the pocket in-place at the end of grade separation just in case the street gets FUBAR'ed, but otherwise you can:
- Go all on-street: N. Harvard/JFK to Eliot St. then loop like the TT's do around the Bennett St. block with maybe a pocket track on Bennett Alley for storage.
- Go all on-street, but instead of looping around Bennett on the surface go directly into the bus tunnel. This is obviously more attractive for customer-facing amenities, but will add some complexity to the build by requiring a track loop-around of Cambridge Common and one block's engagement of Mass Ave.
- Go on-street only to the Memorial Drive light, then turn into JFK Park on a fenced-in trolley reservation more or less where the current path from Memorial gate is. Split the park diagonally, then split the JFK School buildings through the middle with platforms at the plaza facing Brattle Square. Have the same Bennett Alley loop, but allow for reversing direction on the grade-separated platform on the plaza. All park paths impacted by the bisected trolley reservation are relocated in-full a couple feet to the side, and a ped grade crossing by the (possibly relocated a few feet?) monument retain all existing path connectivity. Though the park is more physically divided than before by the trolley reservation fence, no mobility is affected for park-goers except for maybe someone's Ultimate Frisbee game. This variation comes with the advantage of limiting any/all street-running revenue service to just a linear 2000 ft. of N. Harvard + 2 traffic lights...and skipping any/all congestion in the Square by jumping onto the grass. Also will allow for much fuller platform amenities than any curbside stops near Brattle Sq.
- Combo of #2 and #3...do the JFK Park reservation and the Brattle Sq. platform on the plaza, but proceed from there into the bus tunnel with the loopback around Cambridge Common. For continuing the reservation between the Bennett St. and Mt. Auburn St. blocks I guess you could claim the plaza in front of Harvard Square Hotel and/or knock down that ugly-ass stubby parking garage facing Brattle St. that's only used as a makeshift Thrifty Car Rental lot to carve out reservation + plaza between blocks and angle the turn radius at the Mt. Auburn intersection for the bus tunnel portal. While best of all worlds amenity-wise, bus tunnel trip is probably surplus-to-requirement if you can achieve the grade-separated turnback at the JFK plaza.
That's pretty damn good for the first 2 decades of robust service, and a very manageable amount of street-running especially if JFK Park is available to skip a bunch of nasty traffic light queues on the Cambridge side. When it's time to load up for bear to pay for a tunnel, your options are pretty cut-and-dried. First cross N. Harvard St. on grade-separated overpass from whatever intermediate stop is there by the athletic fields. Wind around the back of Harvard Stadium and start inclining down into a portal on the west side. The tunnel trajectory across the river is basically arrow-straight and unobstructed between Stadium and Brattle Sq. splitting the JFK School with only a couple-degree weave required on the Allston side between the old skating rink and the adjacent brick (dorm?) building. No feasibility questions whatsoever...the digging is all under utility-free parkland. It's just the straight-up linear cost of doing a shielded under-river bore at that particular point of Charles Basin...very pricey but no guesswork about the price.
Now...there is some guesswork on the Square side: ex- Red Line tunnel or bus tunnel. Ex-Red should work if it's LRT, as the end of the JFK School plaza at the corner of Bennett/Brattle/Eliot is literally where the old tri-track portal used to be. Compare
1979 view of temporary Harvard-Brattle station, whose platforms were grafted straight onto the portal, to
today's Street View. The 3-story building that houses New England Comics is the common landmark in both images. The former tri-track portion of tunnel runs to a point behind the old ticket windows at the bottom of the main stairs. Past that the tunnel split into bi-level bores feeding the bi-level Red Line bores; that whole portion would be unusable for this project and remain off-limits. A 2-track stub island would fit inside the tunnel dimensions, with the Green Line level accessed by punching through the old tix window area and doing some artful reconfig of the Charlie gates into a sort of 'ring' pattern around the station to cover that new wing. There'd be room outbound of the end of the stub platform for a center pocket track with 1, maybe 2, trains of storage.
If it's BRT or if there's any obscure blockers for LRT (such as the end of the ex- 3-track tunnel being too rough an interface for the fare lobby), you shoot for the bus tunnel instead. Plow through the old Eliot St. portal but bank underneath the Harvard Sq. Hotel plaza and ugly-ass Thrifty garage instead. Use the space under the traffic island at the Mt. Auburn intersection to angle on-trajectory into the busway, and incline-up a connecting tunnel as the main bus tunnel is inclining-down. You will have to figure out something on the Mass Ave. end of the tunnel--either do business with the Cambridge Common surface loop or carve some sort of underground loop--but otherwise the bus tunnel was an ex- dual-mode bus + trolley tunnel until 1958 so much like the Transitway full coexistence is provisioned. For trolley wire you'd simply install combination pole + pantograph compatible wire clips like the Green Line used to have from the mid-70's to mid-90's so poled TT's and panto'ed trolleys can share the same wire...then raise the TT return wire by ~4 inches or so out of safe electrical arc range from a trolley pantograph so nothing shorts out. The end.