Medical Investigation

In Vault City, talk to "Doc" Andrew, the doctor in the outer courtyard near the bar. He will tell you he is worried about the health of people near the railroad. You will have to investigate for him. Visit each of the four stations and question four people at each one, then go back to talk to "Doc" Andrew to get your reward. You will get 100 xp for each station investigated, plus additional xp as well as items when the investigation is complete.

Requirements

• At least 3 train tickets or 300 caps to buy them.
• At least 3 Charisma to talk to "Doc" Andrew, but once you get this quest you can reestablish dialogue with him even with Charisma 1. So if you use Mentats or beer to get Charisma 3 to get the quest, you won't have to use more drugs later to complete it.

Rewards

• 500 xp for each station investigated (total of 4 stations).
• 750 xp after the whole investigation is done and 300 caps with 3 Charisma

[Next has to be checked.]

• 500 xp after the whole investigation is done and 300 caps and 5 stimpaks

Related

This is one of the quests that allow all of the train stations to be highlighted on a character's map. Others include:

• A Man's Job at Boneyard Library.
• The Rail Line Gang uncovers the NCR train station from which you can get to the other stations.