This is an instance, but not in the standard sense. The instance provides fast and direct travel between Stormwind, the Human capital, and Ironforge, the Dwarven/Gnomish capital. This travel is without cost or risk of attack by NPC creeps.
WoW Zone
Deeprun Tram
Level 1-30.

Details
Counts are what the current game build's data holds for this zone.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Way back in beta the tram used to run in between IF and Darn, hence the water and the direction of it, but they were too lazy to change it lol.
Despite that Stormwind lies almost directly south of Ironforge, the tram track runs east - west on the mini-map. Furthermore, there are no bodies of water between the two cities even though the tram passes underwater.
About Deeprun Tram
Deeprun Tram is an area of the Deeprun Tram game map, from Classic. In game it is drawn on the Deeprun Tram dungeon map, which sits inside Stormwind City. No other named area shares that game map.
Named areas inside Deeprun Tram
- Bizmo's Brawlpub
Quest Briefings in Deeprun Tram
The opening lines of the 5 quests the game places in Deeprun Tram, in the quest giver’s own words.
- By Invitation Only?Fancy yourself a Brawlpub contender do you, {class}? They don't let just anyone in there, you know.
- Deeprun Rat RoundupAvast ye scallywag. Arrrr... Arrrr ye looking fer work? We gots a serious rat problem down here an' not enough hands on the poop deck.
- Me Brother, NipsyMe brother, Nipsy, runs a rat kabob operation on the other side of Deeprun. Ye needs to take this here crate o' rats to him before they go bad.
- Questionable QualificationsWell {class}, it's your lucky day. I just happen to have an extremely genuine Brawler's Guild Invitation right here in my stockpile.
- The Gloves Are OffIf you've found yourself an invite you'll be wanting to put it to good use, no? Use your Blood-Soaked Invitation first then talk to a Bouncer in the Brawlpub and get to brawling!
Community notes from Wowhead · 84 comments
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Named areas inside Deeprun Tram, from the current game data.
Quests the game data places in this zone. Open one for its objectives and rewards.
Collectibles from Deeprun Tram
Mounts, toys and battle pets the game data says you can obtain in Deeprun Tram.
Mounts (1)
Pets (2)
Quest Rewards in Deeprun Tram
Blizzard's quest data places 5 quests in Deeprun Tram. Together they award 7,525 experience and 16g 68s in coin. They are open to characters of level 1 to 90.
- Item rewards (2 different items, counting every choice): Blood-Soaked Invitation, Deeprun Rat Kabob.
Totals are summed from the Blizzard game data API quest records for this area; a quest that offers a choice counts every option once.
Quests Across the Deeprun Tram Map
The game marks 4 quests on the Deeprun Tram map. Counted by the in-game map each quest marker is drawn on: 3 on Deeprun Tram and 2 on Deeprun Tram.
A quest with markers on two maps counts on each.
Achievements Tied to Deeprun Tram
1 achievement in the current game data names Deeprun Tram in its criteria.
- Field Photographer (5 points) Take a picture with the S.E.L.F.I.E. camera in all of the locations listed below.