Built in 2002, by Patti Shipyard Incorporated of Pensacola, Florida (hull #158) as the Harvey War Horse for Harvey Gulf International Marine Incorporated of New Orleans, Louisiana.
In 2014, Harvey Gulf International Marine Incorporated's towing division was acquired by the Signet Maritime Corporation of Houston, Texas. Where the tug was renamed as the Signet War Horse I.
Powered by two, EMD 20-710 G7B, turbo diesel engines. With Reintjes WAF 5666 reduction gears, at a ratio of 6.55:1. Turning two, Bird Johnson, 165(in) by 165 (in), stainless steel fixed pitch, propellers, mounted in kort nozzles. And, a Marprop bow thruster, rated at 400 horsepower. She is a twin screw tug, rated at 12,500 horsepower.
Her electrical service is provided by one, 315 kW generator set, on the port side. Driven by a Cummins NTA855G4-D(M) diesel engine. One, 175kW generator set, on the starboard side. Driven by a Tier III compliant, Cummins QSM11-D(M) diesel engine. And, one 99kW emergency generator set. Driven by a Cummins 6CTA8.3 diesel engine. The tug's capacities are 259,241 gallons of fuel, 3,240 gallons of lube oil, 1,048 gallons of hydraulic oil, 51,356 gallons of ballast water, and 15,087 gallons of potable water.
The tug's towing equipment consists of a Markey, double drum towing winch. Outfitted with 3,000(ft) of 3(in) towing wire on each drum. The winch is driven by a dedicated, GM 6-71 diesel engine. With two, 20 ton "deck tuggers." A 350 ton, or 700,000(lb) "shark jaw." With an 10 ton, EBI TC-20 deck crane, Smith Berger 5(ft) by 14(ft) deck level roller. And, 5(ft) diameter, open deck, stern roller, measuring 14(ft) in length.