An assault rifle in the toilet of the men's room, last stall on the left as you enter.
There is a toilet trap in the men's bathroom (at map point 1). It's in the 3rd stall on the right and gives 35 microfusion cells if it is disarmed. To disarm, jump on the toilet's tank and look down into the tank.
If going through the station, returning to the entrance, a dead raider and two low level ghouls may respawn.
In the southwest corner of the train station to the west of the Chevy Chase entrance, there are unusually large metal boxes that contain the usual loot. Two of these boxes stacked are as tall as the player.
Up the stairs from the Tenleytown station and to the right on a pathway between the two ruined buildings, the character may glitch into the building on the left by walking into the first set of three windows that are there.