Built in 2013, by Conrad Shipyard Incorporated of Morgan City, Louisiana (hull #1028) as the HMS Justice for the Gatx Corporation of Chicago, Illinois.
In 2013, Harley Marine Services Incorporated of Seattle, Washington was contracted to manage, crew, and operate the vessel.
In 2019, Harley Marine Services Incorporated became the Centerline Logistics Corporation of Seattle, Washington. Where the tug retained her name.
Powered by two, Tier II compliant Cummins K38M diesel engines. With Twin Disc MGX5321 reduction gears at a ratio of 5.96:1. Turning two, 72(in) four bladed, stainless steel, fixed pitch propellers. For a rated 2,000 horsepower.
Her electrical service is provided by two, 85kW Cummins 6BTA5.9-DM generator sets. The tug's capacities are 30,000 gallons of fuel, 6,000 gallons of water, and 200 gallons of lube oil.
The towing gear consists of two, Nabrico 20-HE Hydro, electric winches, mounted on the bow.