Crowley Maritime said Jan. 2 that it has expanded its harbor services capabilities via the acquisition of Main Line Inc., a vessel mooring company based in Seattle, effective Jan. 1. Terms of the transaction were not disclosed. The addition of Main Line is expected to provide Crowley’s customers calling on the ports of Seattle and Tacoma with a comprehensive solution for their vessel mooring and ship assist needs, the company said in a statement. Main Line is a longtime provider of vessel mooring services in the Pacific Northwest for ship operators who value safe and dependable mooring service. Main Line…