Cosmo wrote:Ok, we already know that:
1) Doube-stacks (and autoracks) don't go with catanairy,(sp? spellcheck is useless here)
2) The old NYNERR/Blackstone/Midland Div/ Franklin Br. is the old H&W route,
3) There's still a flyover from the Dorchester Br to the Midland (though I don't know what the clearance is on the bridge over the NEC)
One can easily bypass the cat by going from SB via the Fairmount to Readville and over the Frank to Walpole and up to Framingham and out the B&A from there.
Could this be the plan? Are there any obstacles anyone else knows of that I can't see on GE?
1) DS can go under wires; it's done every day on parts of SEPTA's West Trenton line amongst other places. Amtrak's electrification specs call for default catenary height of 25 feet + 25½ ft. pantographs on all electric vehicles for retaining contact on non- constant-tension wire. That's 3 feet of clearance above and beyond a DS car.
Of course, that's just wire height out in the open so it doesn't take into account overhead structures. CAHSR's website has a bewilderingly complex specs manual about wire clearances derived from Amtrak's manual from the New Haven-Boston electrification project. It's pretty much the ruling guide for new-construction electrification anywhere in the country. I believe minimum clearance under a bridge for 25 kV lines over an unshielded double-stack railcar is 24 ft. (+/- a couple tenths of inch). And there may be all manner of asterisks about whether it's a metal or concrete bridge superstructure, a tunnel, how long a travel distance it is under a constrained space, and blah blah blah. So worst-possible case would be the same 25' default clearance. I tried to read the specs last year, and it's just too long and technical for me to make sense of it all. It's out there in several PDF's if you want to Google around...but be warned it reads like gibberish to the non-engineer.
2) Worcester-Framingham, Framingham-Walpole, Walpole-Readville, and Walpole-Mansfield-Attleboro-Middleboro STILL are wide clearance routes that cannot have high platforms without passing tracks. CSX has perpetual clearance priority that can only be given up voluntarily. Any abdication of their other wide clearances from Walpole to Milford now that they're pulling out of that portion of the Franklin Line + Milford Branch has to be wholly voluntary like it was with the Fairmount Line and the inner Worcester Line. Most likely the same way they gave up priority elsewhere: by getting max $$$ for a line sale (in this case, the Milford Branch and lower Framingham Secondary are coveted by the state as Milford and Foxboro long-term holds for commuter rail extensions). Bags of money are the only reason Jacksonville allowed the Fairmount Line full-highs to be constructed, and the only reason all Worcester Line stops present or future from West Natick to Back Bay are now fair game for full-highs.
So, for example. . . The T has proposals for rebuilding the Fairmount-side Readville station as an island high platform serviceable by 2 trains at once, but that would be
here moved ~200 ft. north to the other side of the switch, at the opposite end of the parking lot...and would include a second turnout switch for CSX to pull in/out of the yard missing that platform. Walpole can also go full-high so long as the platform stays sandwiched inside the footprint of the wye away from freights turning out on the wye. Foxboro station, for that commuter rail proposal, would be upgraded to a single-track full-high with a passing track for CSX. And South Coast Rail was forced to make a late design change to Taunton Depot station to add a passing track around that 2-track island platform, because CSX complained about it blocking their Middleboro Secondary clearance route.
But all other stops on these routes would never be able to go full-high because there are no passing opps: Ashland to Grafton on the B&A and Endicott to Windsor Gardens on the Franklin. With possible exception of Framingham, since there is very ample room behind the station to carve out a passing track between the two wye legs + junction.
3) Yes. CSX uses that NEC overpass for every single move in and out of Readville except for the Westwood/Stoughton local.
Electrifying the Fairmount Line wouldn't cause any clearance issues for freight to/from Marine Terminal.
-- Single-stacks are a little bit shorter than an MBTA bi-level, so there's adequate wire clearance over the unshielded roof.
-- As noted, there is no need EVER for double stacks right to the port because all freight cars have to stop at an intermediate sorting yard first. There's no room at Worcester, Westborough, or Marine Terminal to break up consists and sort everything in the correct order for either the ships or the intermodal trains. So there will
always be a need for a Readville and/or Framingham to be the intermediate sorting yard for all locals east of Worcester. This is actually a good thing because it keeps Worcester and Marine T. nice and space-efficient for their activity level and locations on premium downtown real estate. The southside freight system 'works' present and future considerations with DS's stopping at I-495.
Electrifying the Worcester Line shouldn't be an issue either.
-- Worcester-Westborough has existing 22-foot cleared overhead structures, and few overhead structures total. Some, like the I-290 overpass by Worcester Union Station are even considerably taller than 25'. It would not be prohibitively expensive to come up with that +2 ft. of under-wire clearance between I-495 and Worcester Union Station.
-- Width exists virtually everywhere Worcester-Westborough for tri-tracking. Unpowered freight passing sidings could be installed around any structures they don't want to raise. And stations can be rebuilt with passing tracks for high-level boarding (albeit at cost of total station do-overs @ Grafton, Westborough, Southborough, and Ashland).
-- Westborough-Framingham is the ex-autorack route. Autoracks are never returning to Framingham, so the extra height will never be needed by CSX even if they find new port business from Boston or Fall River/New Bedford (remember: they need that sorting yard, as no port has the space to assemble DS's straight at the source). Wires can be installed here without raising a single thing or compromising a single existing or likely-future freight job.
-- Inbound of Framingham there's no freight left to begin with, and that Everett produce train can always reach CSX with Pan Am as an intermediary.
-- If there were ever a (highly unlikely) need for something taller-than-usual on the Fitchburg Secondary, reopening derelict Clinton Jct. and detouring north out of Worcester on their PAR overhead rights does that trick. Not that this would ever be needed, but they have their butts covered on anything/everything future needs for the Framingham-Leominster job if they happen to lose their autorack clearances to wires inbound of Westborough.
Electrifying the B&A west of Worcester is probably NOT in the cards.
-- Sheer number of bridges needing expensive +2' clearance raisings is too high.
-- No commuter rail serving up passenger trains per hour to justify it.
-- Amtrak will probably be running true dual-mode vehicles that a diesel gap from Springfield to Worcester between future-electrified Springfield Line and Worcester commuter rail line is trivial to traverse without engine change (plus it's not like electrics would make a difference in speeds up in the hills to begin with).
Electrifying the Franklin is probably NOT in the cards.
-- Those low platforms at the intermediate stops are not raiseable because the Midland was always 2 tracks max and has no room for passing tracks anywhere except maybe Norwood Central (where I think there was once a small yard where the parking lot currently is). Very sub-ideal for ever running level-boarding EMU's or DMU's, so likely always going to remain a push-pull operation.
-- Little electrification demand because of the likelihood of commuter rail branchlines forking out Walpole-Foxboro, Franklin-Milford, and possibly Franklin-Blackstone-Woonsocket some day. Traffic would get too diffuse past Walpole for trains per hour to justify that much extra electrification infrastructure on the branches.
In the *extremely unlikely* event that DS's would ever need to come further inbound or get assembled in the sorting yards, the Franklin is an easier path.
-- Reconnect to Blackstone
-- Pay off P&W with bags of money and upgrades to allow CSX overhead rights on its existing DS route from Worcester to Blackstone. Probably means double-tracking to keep the dispatching peace, but I can't imagine P&W would turn down the money or state-paid upgrades when the CSX alt routing does not in any way change the competitive balance between carriers.
-- Raise the very small number of overhead structures to Walpole, and Walpole-Framingham on an upgraded Framingham Secondary, with CSX getting bags of money for its inconvenience.
-- New 'backdoor' DS route to Framingham via Worcester-Blackstone-Walpole-Framingham. Slower, but total difference in mileage isn't much different, it clears more freight off a passenger-crowded Worcester Line, and it's less expensive than clearing the Worcester Line inbound of Westborough (especially if raised structures have to be future-proofed for electrification).
-- If there's ever a need to assemble Southie DS trains at Readville, of course several more raised bridges inbound gets you there. DS's on the Fairmount are moot, remember, because the port simply doesn't have the room to sort-and-assemble...so Readville is the furthest theoretical inbound point.
-- For all of these reasons and all of the previously listed passenger reasons, electrifying the Franklin's not a real good investment. And it would be nearly impossible to get 24'+ raisings on all of the bridges, so it would outright sacrifice any chance of getting DS's inbound.
Again...there is
NO REASON WHATSOEVER that there will ever be a need to take double stacks any further inbound than I-495 because of the way the southside freight system is space-dependent on intermediate sorting yards in the suburbs. So file any of the above Franklin Line provisions under "100-year potential needs are absolutely impossible to predict today, so don't preclude the far-far future with a shortsighted decision today". Rather than any practical revenue-generating scenario that would ever merit serious talk at any point in your remaining lifetime.