F-Line to Dudley
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This will be a very shallow tunnel. Shimmy under at the Beacon St. bridge, then the tunnel roof becomes the literal commuter rail trackbed. Bonus: the construction can lower the level of the CR tracks slightly to provide enough overclearance to cap Mass Ave.-Beacon St. for air rights. With the levels adjustment, Green would interface with the Porter fare lobby with a ramp down, and CR would interface with a ramp up that's less steep than today's stairs.Adding the "extras" layer to the map, I'm thinking about stop placement on a Watertown branch out of Porter.
Here's my brainstorm:
- Porter (subway under Commuter Rail)
- Portal west(?) of Walden St on south side of Commuter Rail tracks
On a Porter-only build they'd extend tail tracks underneath Mass Ave. through the curve. From there when it's time to extend you're just uncovering the capped tunnel wall and building an incline on the Upland Rd. side of the ROW (i.e. switching sides from where you enter the tunnel @ Beacon). Because the tunnel is so shallow you're probably inclined to the surface by the time you're at Richdale Ave. @ Cambridge Terrace.
No stops here. You need to find a way to grade separate at least the rapid transit mode, because Sherman is a living hell at rush hour. That will preclude doing any stops. Unfortunately the City permitted the apartments abutting the crossing to go right up to the property lines and dangerously screw with the crossing's sightlines. Can't sink the CR tracks because of the busy Yerxa Rd. ped overpass, can't easily raise the CR tracks without trains being in rich folks' back windows, and can't raise the road without trying a ham-fisted S-curve through the Jose's and glass co.'s parking lots to get the rise.
- Sherman Street (West of Sherman adjacent to extant Jose's parking lot. Potential footpath access to Danehy?)
I think a minimally-shallow duck-under of just the GL tracks while leaving the CR tracks at-grade is the only possible solution. If any on-road water/sewer utilities immediately under the crossing surface are ripped out and relocated aside, they could pour a tunnel that gets down in the 800 ft. between Sherman & the ped underpass, and up in the 750 ft. between Sherman and the Watertown Branch split. Extremely doable at trolley grades.
Parkway can probably be underpassed, while rear driveway to Mall can be closed to thru traffic and made into a controlled ped crossing and locked service vehicle gate.
- Fresh Pond Either north of Fresh Pond Parkway or elevated over the parkway
Station probably works best sited by the side entrance/lot to the Mall, with egress to New St. near Bay State Rd. Incline down can start roughly behind Hi-Tech Autobody and the new kickboxing place. Incline up would probably then be between Bank of America and the Mobil station. You'd need to relocate the Vassal Lane ped signal closer to the rotary. So, say the signal goes in front of the BoA parking lot, and there's a little S-curve in the path to get behind the portal wall which would start a few feet earlier.
ROW then travels along the parkway on footprint of the current bike path, with the pike path folded in closer to the Reservoir by the remade ped path. Waterworks driveway could be outright closed to eliminate that grade crossing, and the other driveway that passes over the tracks could have its bridge widened if necessary.
Note that Cottage St. just south of Mt. Auburn will be a retained grade crossing. Very minor low-traffic street so does not merit a stop, but the crossing is that section of neighborhood's only access to the outside world so it has to stay.
- Strawberry Hill (@ Huron Ave)
- Mount Auburn (Behind Star Market)
- Either Grove Street OR Arlington Street (Which would need a new name... Coolidge Hill?)
Arlington is busier and is a crossing that can't be eliminated because of the intersection that sits on top of it. Grove's overpass is extremely tall and an accessibility challenge. It'll make stop spacing to the Mall a little awkwardly close, but otherwise it's pretty clear-cut in favor of Arlington. Trolley phase grafted onto the traffic signals will allow for it.
Note that Watertown Square bulbs out wide enough at the merge w/ N. Beacon that you can have a full reservation platform if the traffic islands adjacent to the Taylor St. intersection were reworked. Otherwise you're looking at some variation of San Fran-style streetcar + bus platforms for Beechwood, H2O Yard, and Morse.
- Watertown Greenway or if you like Watertown Mall (Behind Watertown Mall with path access to Arsenal Street)
- Arsenal (East of School Street where reservation ends and tracks join Arsenal Street)
- Beechwood Ave (Shared bus/trolley station)
- Watertown Square (Shared bus/trolley station somewhere between the branch of North Beacon St and Charles River Rd)
- Watertown Yard (On Galen Street adjacent to the car yard, which would be reactivated)
- Morse Street (Shared bus/trolley station)
- Newton Corner (Station and loop between Pearl and Washington west of Centre)