A transporter used by 29th-century Starfleet timeships to send operatives to precise points in time as well as space, seen aboard the USS Relativity in Voyager.
A temporal transporter works like an ordinary transporter but delivers its subject to a chosen moment in history. It is part of the equipment of the Federation timeships of the 29th century that police the timeline.
It appears in the Voyager episode Relativity. Captain Braxton and Lieutenant Ducane of the timeship Relativity recruit Seven of Nine and beam her to several points in Voyager's past, including the ship's time in dry dock at Utopia Planitia, to find a bomb planted by a saboteur.
The process is hazardous: too many trips cause a disorder called temporal psychosis, so the number of jumps one person can make is limited. The saboteur proves to be a future, unbalanced version of Braxton himself.