Maintenance and operations?  Absolutely.  Once built, it's only around 40 miles to maintain.  ISER has identified 5 different mineral deposits that become commercially viable if the railroad can get them to tidewater at Point MacKenzie instead of having to go all the way to Seward or Whittier (saving some 80 miles of rail transit, and avoiding the noise restrictions of Anchorage).  Even if only one of those 5 materialize, the freight revenue should be able to pay for the maintenance of 40 miles of track.

I don't know that the line will ever pay the cost of construction, mind you.