During the End War, Moebius Corps started ferrying supplies and troops via an old railway on Tarsonis. Graven Hill was tasked with destroying the trains by the Terran Dominion, but his contacts weren't able to arrive in time. He then tasked allied forces with destroying the trains before they escaped.
The mission's gameplay is similar to that of "The Great Train Robbery" from Wings of Liberty. Players must take out Moebius Corps trains before they arrive at their terminus points.
Two players spawn in the middle of the map, with two expansions to the northwest on high ground. Over time, trains will come along the two tracks in a pre-set pattern - the top track, then the middle, top, both tracks at once, middle, both tracks, and finally the middle track twice in a row. The players must destroy the trains before they reach the far side of the map; if two trains escape the mission is lost. The trains will be escorted by increasingly large numbers of enemy units, including hybrid.
The close proximity of the expansions means they can be taken early if desired. It is best to defend the low ground below the ramps into the main base instead of the tops of the ramps, as this will not only protect the ramp to the expansion, but defenders will be in prime position to attack the trains as they pass. Two additional points to stage an offensive on the trains are the small high ground areas north and south-west of the main base. The latter has an enemy garrison to clear out first, but both provide a vantage point to assail the trains from.
During the third and seventh-eighth trains, a faster train will pass by on the third, lower track. It can be destroyed for bonus experience, but no penalties will be incurred if it escapes.
When defending, a word of warning concerning the escorts that accompany the trains. The player that holds the left-side mineral field in the main base is vulnerable to attack over their mineral lines, which overlook the trains close enough that enemy units escorting the train can attack the player's workers. Either erect automated defenses around the mineral line to hold off attacks, or attack and destroy the enemy escort before it gets close enough.
The following mutators have been applied to Oblivion Express.
- Well Trained (current)
- Fowl Play
- Cold is the Void
- Wheel of Misfortune
- Diplomatic Immunity
- Boom Town
- Train of the Dead
- Train of Pain
- By Fire Be Purged
- Catch the Train
- Railroad Switch
- Hell Train
- This mission was revealed in the second trailer for Co-op Missions. It originally featured the Tal'darim as enemies.
- Unlike other maps, players can determine whether they are playing against zerg or not from the very beginning of the match by presence or absence of the creep on the low ground right next to the players' bases.
- Blizzard Entertainment. StarCraft II: Wings of Liberty. Vivendi Games. Mission: The Great Train Robbery. (in English). 2015-11-10.
- Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. Mission: Co-op Missions, Oblivion Express (in English). 2015-11-17.
- Co-Op Missions. 2015-08-05. StarCraft II: Legacy of the Void - Allied Commanders Preview. Youtube. Accessed 2016-02-18.