Tug

In starship classification, a tug, tow ship, or towing vessel was a starship specialized for towing other starships or similarly large objects with tractor beams. 

History
In 2285, the schematics of the Federation starship, designed as a tug / transport ship for large containers, was displayed on the monitors on the bridge of the USS Enterprise (NCC-1701). 

Following the discovery of the USS Stargazer in 2364, the USS Enterprise (NCC-1701-D) received a communique from Starfleet Command informing them that a tug would rendezvous with them to tow the Stargazer back to Xendi Starbase 9. 

When the Enterprise-D experienced a series of engine problems in 2370, leaving the vessel adrift and potentially thwarting Captain Picard's arrival at Starbase 84 for the Admirals' Banquet, Vice Admiral Nakamura inquired if they were going have have the problem fixed soon, or if he had to send a tow ship to bring the Enterprise in. Picard declined the offer for a tow, stating that he had the utmost confidence in his engineers to getting the problem fixed. 

During the Dominion War, Federation tugs were utilized in the evacuation of disabled vessels from battle zones. The USS Fredrickson was one such starship to benefit from these utility vessels in 2374. 

After acquiring a vessel, later named Alice, from a Haakonian trader, Abaddon tried to turn the ship into a towing vessel. At first the ship cooperated, but later began to require constant repairs. He sold the ship to the crew of the USS Voyager in 2376. 

Tugs by race

 * Federation tug
 * Federation tug

Bergungsschiff Rimorchiatore タグ