The Transpolyporter in Booty Bay.
Ever watch Star Trek? Then you know what this is, at least in principle.
There are 6 transporters in WoW.
Booty Bay[]
Note: This transporter does not require engineering It is not necessary to first complete the Rig Wars quest. This transporter is a free to use horde-only transporter to the dungeon of gnomeregan, allowing horde players a safe way to the dungeon without having to go trough the Alliance lands. Alliance players cannot get and do these quests.
Gnomeregan[]
This is the destination of the Booty Bay transporter. Horde Players can use this to transport back to Booty Bay. See Booty Bay above.
Gadgetzan[]
Only Gnomish Engineers with engineering at level 260 can use this transporter. And it's actually only a destination - players must first create the [Ultrasafe Transporter: Gadgetzan], which can be used anywhere to transport the player to the Gadgetzan Transporter. Usually.
This is clearly the most useful of the two Engineering transporters, since it takes forever to get to Gadgetzan, which has a neutral AH. (Deprecated; everlook now also has an neutral AH)
Everlook[]
Only Goblin Engineers can use this transporter. And it's actually only a destination - players must first create the [Dimensional Ripper - Everlook], which can be used anywhere to transport the player to the Everlook Transporter. Usually.
This is good for higher level players who quest and grind in Winterspring. It's a good transport to get to the northern part of the continent. (as of patch 4.0.3, Everlook also has a Neutral AH now)
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Only Gnomish Engineers with engineering at level 350 can use this transporter. And it's actually only a destination - players must first create the [Ultrasafe Transporter: Toshley's Station], which can be used anywhere to transport the player to the Toshley's Station Transporter.
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Only Goblin Engineers with engineering at level 350 can use this transporter. And it's actually only a destination - players must first create the [Dimensional Ripper - Area 52], which can be used anywhere to transport the player to the Area 52 Transporter.