2. When Proceedings in Rem Will Lie.—
Generally speaking, every maritime lien includes the right to enforce it by a proceeding in rem. The person who has a maritime lien upon a vessel is entitled to proceed directly against her in a court of admiralty for the locality in which she happens to be. Thus in all suits by materialmen for supplies, repairs, or other necessaries; in all suits for mariners' wages, pilotage, collision, towage, hypothecation, bottomry, salvage, and the like, the process may be in rem.