The real problem is the non existent economy of northern Maine. They just do not generate enough rail traffic to support a profitable rail operation without some type of govt support. There is too much dependence on forest products that tend to suffer in recession. Maine is less and less competitive with forest products as compared to Canadian sources or the Southeast USA.
The MM&A is losing 4 to 5 million a year operating the line. The scrap value of the 220 miles of line is about 20 million, so this is tempting to convert a loss into a multi million dollar gain, money that can be used to support the remaining lines. Remember the MM&A has a debt service to pay for, the line was acquired for 50 million dollars and they have lost considerable sums over the years.
each mile of rail has 2,640 rail ties, at $40 each, that is $105,640 per mile.
100 lb relay rail is priced in April at $685 per ton. a mile of railroad (two miles of rail) has 176 tons of iron, at a cost of $120,560 per mile (and that's just the cost of the rail, not installation, sleepers, spikes etc).
So the value of ties and rail, for one mile of railroad, is $226,000. to support this infrastructure you need rail traffic, and Maine just does not have a lot of that.
It could make sense for the State the subsidize the lines, since there will be added cost to maintain the roads if all traffic is diverted from rail to them. Also the loss of employment from the shut down of rail service could cost the state a lot of tax revenue, which would offset the cost to support the rail infrastructure.