Monorail sabotage plans is a holotape in Fallout: New Vegas.
Location[]
It can be obtained from a garbage can in the Camp McCarran terminal building during the quest I Put a Spell on You if one chooses to side with the Legion.
Transcript[]
The papers here include schematics and recipes for explosives and blueprints for a monorail car with several points of vulnerability marked. They are all marked with a stamp bearing the logo of Caesar's Legion.