Unlike other metro tunnels where the trains have been rendered useless and the player character is forced to walk from station to station, or the train tunnel leading to the Pitt where a loading screen takes the place of an actual journey, the presidential metro line is usable.
About halfway down the second tunnel, one can look through a fence and watch two feral ghouls get splattered by a metro train.
There is a massive battle between the feral ghouls and robots which the player character can learn about from M.A.R.Go.T. The numbers and strength of the ghouls can overwhelm the robots after awhile, so the player character should help out the robots or face getting rushed by the ghouls once they are done with the robots. Alternatively, if one is finding the ghouls too tough to make it through, they are fooled by the ghoul mask. This will give the player character the opportunity to take them by surprise or avoid them to save ammunition and stimpaks.
The fuses needed to activate the metro are on the presidential sentry bot. He will automatically replace the fuses once the ghouls are killed (thus clearing the security breach). One may have to go back talk to M.A.R.Go.T again. She will tell the player character that the main repairs will now begin, and once they get back to the train, they will see the presidential sentry bot replace the fuse, enabling the metro.
The fuses can also be acquired by hitting the presidential sentry bot's combat inhibitor while it is facing a turret or sentry bot. The presidential sentry bot will attack the other robot and become hostile. It can be killed and the fuses looted.
If the player character did not find the Senate employee ID, they can force the computer to reprogram with a high enough Science skill.
This area contains many Easter eggs, and one should take a second look at what appear to be dead ends.
At the junction where the working metro can take one to Adams AFB, there are two locked doors requiring a key to enter. There is no key to be found, however. The doors open when the presidential metro bot is killed, although this will make all other bots/turrets turn hostile. There is no loot behind these doors (just more bots). If the presidential metro bot is shot in the combat inhibitor, causing it to frenzy, the other bots/turrets will attack it. However, the doors will not open.
Past the M.A.R.Go.T. computer entrance, at the end of the tracks there's a gnome with a camera and on the tracks, are two teddy bears tied to the tracks with a note saying 'Help Us' between them.
If one has a high enough Science skill or the Senate employee ID is found, M.A.R.Go.T. will report that the last time the metro line was in use was 200 years and 8 months before the current date.
The cutscene in which you travel through the subway on the train isn't actually a train. The game equips an NPC with a massive piece of headgear that resembles the inside of the train, with your player character running along the track at very high speed, simulating that you're moving through the subway on a train.
PCPlaystation 3Xbox 360 Occasionally, when the reaver is killed, it may fling back down the hall where it came from. [verified]
PCXbox 360 Reavers in this area may be affected by a physics bug that causes them to jitter and shake rapidly. This makes them very difficult to target and rounds often pass through them without dealing any damage, even inside VATS. This may be related to the aforementioned bug, as when killed they often fly some distance. Explosives still have full effect. [verified]