TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: TRAINS 
Clue: As of 2006, you can take a 48-hr. ride between these 2 cities, with a stretch on the world's highest railroad

SOLUTION: beijing & lhasa

PROBLEM: Category: STATE CAPITALS 
Clue: Baton Rouge & this other state capital both have 2-word French names; neither is named for a person

SOLUTION: des moines

PROBLEM: Category: HISTORIC DOCUMENTS 
Clue: It's the shorter, better-known name of the document "United States-Vietnam Relations, 1945-1967"

SOLUTION:
the pentagon papers