Black Mesa Transit System
For other uses, see Black Mesa (disambiguation).
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The Black Mesa Transit System is the extensive monorail network linking the many different Sectors of the Black Mesa Research Facility. The Transit System is the primary form of transportation throughout the facility, which uses the monorail system, a transportation system based on a single beam. Provided for the security, comfort and convenience of the Black Mesa personnel, residents and visitors, it is managed by the Black Mesa Transit Authority.
- Each train consists of a single monorail car driven automatically. It includes seats, a wheelchair space, windows, speakers and an electric door.
- The network is equipped with an announcement system which is mounted on the trams to give general information about the facility and mention each stop, with a prerecorded female voice. It is voiced by Kathy Levin, who also provided the voice of Gina Cross and her Holographic Assistant counterpart, suggesting Cross herself might have recorded it.
- The protagonists of the game use the Transit System before and after the Black Mesa Incident to get around the facility. Gordon Freeman and Barney Calhoun for example ride a tram to work from their dormitories shortly before the incident. Adrian Shephard also briefly hitches a ride on a damaged tram before being left behind by the USMC.
- The Black Mesa Transit System should not be confused with Sector E's Materials Transport, the dilapidated freight monorail network.
 Lines and other areas
The network is divided in four colored lines linking to particular areas of the seven main Sectors and other areas, and sub-lines. Each line serves three or four areas.
 Main colored lines
 Red Line
 Blue Line
 Green Line
 Yellow Line
Each Sector has apparently its line, a sub-line to the overall network. Only three are seen/mentioned during the games:
 Sector B Line
A medium-security line connected to the Area 9 Security Checkpoint.
 Sector C Line
A medium-security line, it is connected to Area 9 Security Checkpoint, Level 3 Dormitories, Area 3 Medium Security Facilities, and Test Labs. Gordon Freeman and Barney Calhoun take it to reach their respective workplaces on the day of the Black Mesa Incident, Barney from Area 9 Security Checkpoint, Gordon from Level 3 Dormitories. Before the Test Labs stop, the line passes beside another, leading to Level A of Sector E Subsurface Transport, and taken by Adrian Shephard after leaving the Infirmary.
 Sector E Line
Connected to Area 9 Security Checkpoint, it is located below the Sector B Line and above the Sector C Line. Its directions are unknown.
 Sector E Subsurface Transport
Level A of this Black Mesa Transit System section can be accessed from Sector C Line, where the G-Man is first seen in Half-Life, and leads to an unnamed area where the first Shock Trooper and zombie security guards are encountered.
 Central Transit Hub
The Central Transit Hub is only mentioned and never actually visited. It is apparently the only Transit System station where high-security trains can be boarded. Area 9 Central Transit Hub is also the original final destination of the tram used by Barney Calhoun before it is rerouted to the Sector C Line. It is connected to the Blue Line of the Black Mesa Transit System. The Central Transit Hub was originally intended to be visited in Half-Life: Decay, but the mission was cut from the final game.
Barney Calhoun knocking on the Area 3 Security Facilities door along the tracks.
The G-Man standing in a tram with a scientist.
 Half-Life: Opposing Force
 Half-Life: Blue Shift
Fast food outlet seen by Barney Calhoun.
Scientist reading The Mesa Times while waiting for his laundry to be done in the laundromat.
 Half-Life: Decay
 List of appearances
- Half-Life (First appearance)
- Half-Life: Opposing Force
- Half-Life: Blue Shift
- Half-Life: Decay
- Half-Life 2: Raising the Bar
|Half-Life story arc journey (1)||Succeeded by|
|Half-Life story arc journey (2)||Succeeded by|
Level 3 Dormitories
Level 3 Dormitories
|Half-Life story arc journey (3)||Succeeded by|
Black Mesa Medical Lab
|Half-Life: Opposing Force story arc journey||Succeeded by|
Sector E Materials Transport
Area 8 Topside Dormitories
|Half-Life: Blue Shift story arc journey||Succeeded by|
Area 3 Medium Security Facilities
|Half-Life: Decay story arc journey (1)||Succeeded by|
Level 3 Dormitories
Level 3 Dormitories
|Half-Life: Decay story arc journey (2)||Succeeded by|
Black Mesa Air Control
|Vehicles, vessels and transportation|
|Aperture Science transportation||Borealis · Teleportation|
|Black Mesa transportation||Black Mesa SUV · Black Mesa Transit System · Black Mesa truck · Rail cart · Teleportation|
|Black Ops transportation||AH-64 Apache · M44 cargo truck|
|HECU transportation||AH-64 Apache · Jet · M1A1 Abrams · M2A3 Bradley · M44 cargo truck · Osprey Heliplane|
|Combine transportations||Advisor Platform · Armored Personnel Carrier · Hunter-Chopper · Razor Train · Teleportation|
|Resistance transportation||Airboat · Mil Mi-8 · Muscle Car · Scout Car · Teleportation|
|Xen transportation||Alien Craft · Teleportation|
|Trainstations||City 17 Trainstation · Depot · Technical Trainstation|
|Other||Rail transport · Road transport|
|Black Ops (cut)||Osprey Heliplane|
|Combine (cut)||AirEx Truck · C-130 · Combine SWAT Truck · M2A3 Bradley · Merkava · Osprey Heliplane · School Bus|
|Resistance (cut)||Borealis · C-130 · Jalopy · Jet Ski · Osprey Heliplane · Submarine|
|Other (cut)||Digger · Stealth|