BBF -- I agree
However, its somewhat more complicated because of the mix of Turnpike Tolls, Fuel Tax, Registration Fees, etc.
As far as I understand it -- money from the above goes into the general funds and then maintenance costs for highways comes out -- So, outside of the Turnpike Authority's responsibilities it is difficult to parce the DOT spreadsheet
As I've recommended for many years the best approach is to take all of the M authorities associated in any way with the Greater Boston area (T, Massport, BCEC, MWRA, Highways within I-495, etc.) and consolidate them all under a Metropolitan Boston County -- roughly everything inside or on I-495 and with:
1) an elected Legislature -- population apportioned by districts
2) an executive council elected at-large
a) Department of Infrastructure and Transportation
b) power to tax and issue revenue bonds
I would also say that all publicly-owned railroad ROW's in the state be consolidated under the EOT. Right now 6 state agencies split the ownership:
-- the EOT for out-of-district lines.
-- the T, but also including abandoned stuff that will never ever ever be a passenger consideration this century or next, like the Ayer-Pepperell-Greenville, NH branch, the Topsfield and North Reading branches, dead-end Stoneham Branch, dead-end Hanover Branch. Plus the actual MPO-rated commuter rail preservation corridors like Danvers, Millis, Methuen, Portsmouth, NH that they seemingly can't wait to fart away to the first shitty trail lobby that shows up.
-- MassHighway/Turnpike Authority. Owns the Worcester Line next to the Pike.
-- Mass Water Resources Authority. Owns the Fore River freight branch off Greenbush where waste product from the sewage plant gets carted off to CSX in tankers.
-- Massport. Owns the Southie and Charlestown tracks to the shipping docks, with plans to reactivate both for freight.
-- DCR, on some trailed abandoned lines like Franklin-Blackstone...but not most of them which are T or EOT. But they have to get called in to manage when the T doles out a 99-year/$1 lease to some all-volunteer scam lobby that then refuses to maintain its trail...like is happening now in Danvers and Lynnfield, and will for dead-certain happen in Methuen and Dover/Medfield.
And they all fight with or impede each other. Especially the T, which is the most out-of-step with the state's official Freight and Rail Plan with its trail follies, passive-aggressively messing up freight access to Boston with things like the GLX yard shredding Pan Am's yard trackage, and flipping off the PTC mandate with their spending orgy on station headhouses while doing squat to ponder their >50% non-compliant signals. Every other New England state has its RR's owned by the DOT with buck stopping one place. For example, Connecticut DOT owns every piece of Metro North track in its borders, a majority of its freight track, and all landbanked trails as linear state parks with no leases to outside groups or NIMBY malingerers. Not surprisingly they're also in excellent shape to meet the PTC deadline and only have 1 half-funded Metro North branch left to prep. NH owns all its abandoned lines and offers up trails "as-is" with no warranty or amenities...treating them as passable roadbeds, not parks. Single ownership cuts out so much of this riff-raff that's eating the T alive out in the 'burbs and accelerating the decline of freight inside 495 while it's having a big rebirth outside 495.
The rails are common carriers of multiple services. Freight on a majority of them, Amtrak on 3 very critical interstate lines, and even private passenger carriers like Cape Cod Central RR possibly using portions of T territory. The rails should be owned by a single entity that approves the usage considerations. Let the T keep ownership of stations, layover yards...any passenger-only properties. Let them own the rapid transit system and any RR ROW's shared with rapid transit (Braintree, Orange north and south)...at most, draw the line at 128 if they want to keep long-term rapid transit holds like Blue to North Shore, Orange-Reading, Orange-Needham, Red-Lexington in the circular file. Tap the T track dept. for maintenance, even giving them (properly budget-reimbursed) jobs on statewide track to keep it efficient. Take ownership of all the landbanked trails from the T and DCR where a RR operating charter exists for preservation. Trails are good, but somebody's got to decide which places are worth having one instead of one owning agency punking another maintaining agency with garbage trails it doesn't want or have money for.
But treat the FRA-standard rail ROW's like common-use roads under a highway dept. so somebody's ruling for all users' needs and keeping these sub-agencies in line. This works quite well in neighboring states. They don't induce as many dumb mistakes or fall victim to as many NIMBY Operation Chaos games as here. Because this public utility is not a six-headed monster of conflicting interests and turf wars like it is here.