In re General Marine Construction Corp.

WEBBER, Justice.

This was an appeal from an order of the Public Utilities Commission granting a permit to General Marine Construction Corp. to engage in water carrier service limited as follows:

“Irregular Routes. Heavy equipment and material which, because of its size or weight requires the use of a crane-equipped barge in unscheduled service between Portland and (certain islands of Casco Bay) and between said islands.”

The Intervenor Casco Bay Lines, Inc., a water common carrier furnishing scheduled service for the transportation of persons and property between Portland and the islands, has…