Following In His Footsteps Walkthrough - Fallout 3 - Page No. 2
Farragut Metro Station West is only a short distance from the Super Duper Mart, just across the river.
Not far inside the Metro Station you'll see a door on your right. Head on through it and search the rooms beyond.
You can activate this Protection bot using the Terminal on the wall. But make sure you have a Metro Ticket first. You can find those in the desks in the next room.
Search the desks and the filing cabinets. You can find a lot of stuff. The Metro Tickets are in the desks.
When you are done searching the side rooms, return to the main corridor. Watch out for Molerats, there are a few of them up ahead. You're looking for the door on the right at the end of the main corridor.
Check out the small room through the door to the left. Then proceed through the door on the right.