The system is run on Midgar Standard Time, with the system threaded throughout the city's upper plate and linked to a neglected Train Graveyard in the city's slums via a giant circular track that spirals up the city's central pillar. These rail systems are heavily monitored by the city's security system, with various security checkpoints along the routes used to automatically scan the ID cards of the passengers. An invalid ID results in the train being locked down car by car.
Another train can be seen at the Sector 1 Station, which links to the Sector 5 Slums with Sector 8. The train is called the MK93 II, however, a boy at the platform says that an even newer model, the MK100-90, is in the works.
As the professor is carrying classified materials on SOLDIER, and so is a highly valuable target, a small unit of Shinra Military troops are also issued to ensure her protection; among them a young trooper called Cloud Strife.
The Midgar train system is used by Cloud and the members of the reformed AVALANCHE group to enter Sector 1 and bomb the Sector 1 Reactor and later used to escape the scene; using fake ID cards, they then returned to the Sector 7 Slums.
Last Train from Midgar
Accessed from the Sector 8 - Bridge after a cutscene, Cloud meets the rest of AVALANCHE in this car. It is dark with a blue tint, due to its lighting, and mostly metallic and filled with wiideb crates, and contains no passengers.
The second car, this contains a few passengers, until Barret scares most of them away. To Sector 7 - Sector 7 Slums Station. The car contains green benches along the side, and all the members of AVALANCHE can be interacted with here. At the front right, Jessie stands next to a routemap, which Cloud can access by speaking to her.
Train to Sector 4
The first car accessed from Sector 7 - Sector 7 Slums Station. This contains multiple non-player characters, though the one at the back-right can offer an item when spoken to, which is 1 Phoenix Down. The timer here is fifteen seconds.
The second car is identical in appearance, though the camera angle is flipped. This time, the non-player character at the front-left must be spoken to in order to obtain the item here, which is 1 Hi-Potion. The timer here is fifteen seconds.
The third car is viewed from a completely different top-down camera angle. This car features a gil thief who robs exactly 100 gil from the player (if the player has less than 100 gil, nothing happens), who can be chased down and made to return their gil. The timer here is thirty seconds.
The fourth car is identical in appearance to the third, and features no non-player characters with items. The timer here is seventeen seconds.
The fifth car is identical in appearance to the first. This is the final car, and the party always gets off here. The passengers here are all Shinra soldiers.
The Coal Train is drastically different from the train in Midgar, as it is not used as commercial transport, but instead to move Materia around, and not running on Mako energy, the Coal Train
Each sector in Midgar has at least one train station, making a total of eight stations used by passengers to embark and disembark at various points in the city proper.
In the Midgar slums there exists at least one station, which is also linked to the Train Graveyard.
Train from Midgar
When Cloud arrives in the train, the only goal here is to interact with each of AVALANCHE, or particularly, to speak with Jessie and view the routemap.
Train to Sector 4 escape
Upon accessing the train, an ID scan forces Cloud, Barret and Tifa to run down through the cars to avoid the scan on a timer for each. At most cars, there is the potential to gain or regain an item:
- On the first car, there is a fifteen seconds timer. Running to the back to speak to a non-player character in the back-right of the room will reward the player with a Phoenix Down, before running down and reaching the next car.
- On the second car, there is also a fifteen seconds timer. The non-player character at the front-left will provide a Hi-Potion when answering him with a "Yeah..." when spoken to.
- On the third car, thirty seconds are given instead of fifteen, when a thief robs gil from the player; following the thief up and answering with "That's right" will grant them the gil back.
- The fourth car is on a seventeen seconds timer, and has no items.
- The fifth car has no timer. A cutscene will trigger here, and the group can leave.
If the countdown ends on any of the cars, the player will jump off early. The car the player jumps off at corresponds to the tunnel arrived at. Lower car numbers means the player jumps off further south in the tunnel, which is further from the storyline goal.
The Coal Train requires the player to prevent it crashing in order to unlock the Huge Materia.
The two Midgar trains can both have a slight effect on the hidden date mechanics.
- "Thanks anyway" (No change)
- "Looking forward to it" (-3 Tifa)
On the second train to Sector 4, getting through the train without being caught by the security system affects the date mechanics in a following manner: (+5 Tifa, +5 Barret)
- There are also abandoned rail systems running through Mt. Corel; an abandoned mining location and site for a destroyed Mako Reactor, but are only used once by Shinra in Final Fantasy VII to transport a Huge Materia. Cloud's party, temporarily led by Cid Highwind, attacks this train to save the Materia. The train goes out of control and depending upon the player's actions it can be stopped or will crash into the town of North Corel.
- Although it is revealed that the train was part of a holographic training simulation, the opening scene of Crisis Core -Final Fantasy VII- mirrors the start of the original Final Fantasy VII.
- The opening scene of Final Fantasy VII was later remade as a technical demo of the PlayStation 3's graphic system.
- Built underneath Midgar, Deepground has a separate monorail system that ferries people through the underground city to various locations.