Back Road and Lower Road...and a smidge of Rockland? Whoa. Let's not get carried away here. Amtrak is not going to be doing total blanket coverage throughout Maine. If NNEPRA really wants that they're going to have to start shelling out for their own homegrown trainsets Carolinian-style because Amtrak's got way better places to go with its rolling stock and a lot of other prospective state-sponsored routes to choose from that'll net much higher margins than the north-of-Portland 'Family Tree'. It does take two to tango here. NNEPRA can't just wave a wad a bills in front of Amtrak's face, say "OBEY", and expect to get instant satisfaction. Maine isn't the only state that wants new routes, and some of those other routes serve much bigger populations than that you're talking here while diversifying the Amtrak system in more distributed (and thus politically valuable) locations. Maine is not Virginia. I don't care how many times it's said on these threads that the population numbers don't tell the whole story about demand...if there's 5 new state-sponsored routes bidding for Amtrak's attention and equipment, numbers matter the world.
If NNEPRA wants their cake to eat everywhere then it's going to be up to them to develop a commuter/regional rail plan for it all that they can contract out to someone else, usefully coordinate with transfers, and launch without sugar-daddy Amtrak having to run the whole shebang. And they don't have those kinds of resources. If they don't have those kinds of resources, they have to go back to the drawing board not over-assume their leverage to hit up Amtrak for infinitely forking one-seat schedules.
Focus. Augusta is obvious. It's a continuation off one Downeaster route, one Downeaster schedule. That's very doable. Rockland?...Maine Eastern's got a good thing going. Fund them for more frequent schedules out of Brunswick, more equipment, faster track. This all sets up an obvious future trajectory to Bangor, which is pretty much the furthest extent to tie the Downeaster up nicely in a bow. And will get freight considerations, because whoever buys the most Class 4 track miles reaching closest to Waterville is going to get PAR's immediate interest at routing thru freight.
Auburn/Lewiston? Amtrak's not going to do that. Amtrak's going to go back to NNEPRA and ask them what's so intolerable about running a thruway coach all of 20 miles up Route 196 from Brunswick or 35 miles up I-95 from Portland where the transfer frequencies are going to fetch more bodies than schedule-diluted forking one-seats. Then point to every other thruway coach in the country that's holding its own quite well thank you for the very same reason. NNEPRA's got no defense for that. NNEPRA's got no defense for why they aren't doing that this bloody second.
And yes...the Back Road to Waterville will be done as a freight route if the Lower Road becomes the "somebody else is paying for it" path of least resistance for PAR. MEDOT's going to learn the hard way that not every ROW is saveable when the traffic and joint stakeholders aren't there. They're just too small a state to float more than half the route miles in their far-flung state rail network on their own backs, especially when there's so much route duplication. Two Augusta roads, outlandish fantasies about Lewiston Lower, the World's Loneliest Baked Beans Delivery, the Mountain, Calais, "every low-margin branchline as precious as the last"...maybe even Bangor-Keag if its latest stay of execution doesn't pan out...they can't juggle it all. No other New England state attempts to juggle it all and carry the whole entirety of the weight of those rails on its modestly-built shoulders. It's just not practical.
Mission-critical routes that can pack the most joint stakeholders in a room are the consensus ones that get the investment. It's how MA, VT, RI, CT, and even kinda-sorta NH do it. For Maine that means [Pick an Augusta Road], SLR and Yarmouth-Danville, CMQR main, and the Irving main as the utmost-important investments. And that means, yes, you can plan a Downeaster to Augusta, Waterville, Bangor to bring the most stakeholders together in one place (but you can't do it duplicate ways). Yes, you can earmark SLR as the deep long-term Canadian corridor...but you can't have it every which way (Yarmouth-Danville, not rebuilding Lewiston Lower and sending it places it never went before...not tarting up the World's Loneliest Baked Beans Delivery route because reasons). Yes, you can try to attract the Atlantic back someday onto its old CMQR + Irving routing...and yes, a thruway coach from the Downeaster's outer terminus to Brownville or Keag would probably fetch some interest. And yes, they should absolutely support the good thing they've got going with Maine Eastern. And yes, the skunkworks tourist lines BML and DSRX should get some love as the Downeaster advances closer and closer to their neck of the woods.
But c'mon. Not everything is equal. Make the best of some really good opportunities, but don't get disappointed that every mouth can't be fed and every line doesn't have limitless upside. Maine's rail network hasn't consolidated to the max-efficiency essentials like its 5 New England neighbors. A good thing because they can preserve the critical corridors with foresight, not lament their loss after the fact with regret. But it's going to get trimmed further. It has to. There isn't enough freight left and isn't enough passenger density potential to fill every nook and cranny. Some of the less essentials either will have to go when they're no longer sustainable, or be left to sink or swim on their remaining traffic while real-world priorities stick to the shortlist of high-margin investments. And some of the mothballeds are going to stay in mothballs (though nobody is saying Mountain and Calais have to get declared extinct and ripped out for a rail trail). It's just not a state that's ever going to have the tax base to subsidize everything for everyone. I would seriously re-orient to picking one set of tracks and driving a locomotive on it. Especially in light of all the somewhat nutty route duplication just north of Portland.