Built in 1968, by St. Louis Ship of St. Louis, Missouri (hull #2535) as the Marjorie McAllister for McAllister Towing of New York, New York.
On the 2nd of November, 1969 the tug sank with all six hands off the coast of North Carolina.
In 1972, her wreck was discovered and salvaged. The tug was then refurbished.
In 1980, she was renamed as the Tracy Anne Witte and entered service for the Donjon Marine Company of Hillside, New Jersey.
In 1983, she was acquired by the Eklof Marine Corporation of Staten Island, New York. Where she was renamed as the Thor.
In 1999, she was reacquired by McAllister Towing and Transportation of New York, New York. Where she was renamed as the Mary L. McAllister.
The tug is an ABS Classed +A-1 Towing, A.M.S. tug. She is a single screw tug mounted in a kort nozzle with a flanking rudder powered by a single EMD 20-645-E3A Turbo main engine, with a Falk reduction gear at a ratio of 6.552:1 for a rated 4,000 horsepower.
She is outfitted with three fire stations and an Aurora Fire Pump rated at 500 Gallons Per Minute.
The tug's capacities are 97,550 gallons of fuel oil, 950 gallons of lube oil, and 3,000 gallons of potable water.
Her towing gear consists of a single drum equipped 2,000(ft) of 2(in) towing wire.