See if you can assist Captain Curtis with his operation at Camp McCarran.
Offer to help Colonel Hsu to find the spy.
Report Colonel Hsu's refusal to Captain Curtis.
Pick up the explosives and bomb ingredients in the trash can by the ticketing counter at the Camp McCarran terminal building.
Pick up the explosives in the in the trash can by the ticketing counter at the Camp McCarran terminal building.
Plant an explosive charge in a vent at the back wall of the McCarran monorail car.
Get off the train and watch it depart.
Plant a fission battery, conductor, Wonderglue, a box of Abraxo Cleaner, and the plans inside Private Crenshaw's footlocker.
Kill Private Crenshaw.
Report to Colonel Hsu and frame Private Crenshaw.
Return to Captain Curtis.
If the NCR has branded you a terrorist for working with Caesar, Captain Curtis will attack you on sight, even if you are dressed as a member of the NCR. This can be quite common if you are doing the quest Render Unto Caesar and you received the quest from Vulpes Inculta. This will render the quest impossible to complete. Also, killing him then traveling to The Fort, all Legion members will be hostile. Wait three in-game days and they should not be hostile anymore.
If you are labeled shunned by the NCR you can convince Col. Hsu that you are worthy of another shot, you can gain an unlimited amount of experience points.
Once you collect the explosive charge, you are committed to the Legion arc of the quest and can't use the monorail even if you fail the mission by killing Curtis.
During The Finger of Suspicion, you need to tell Martina that it was the Legion who sent you to protect her, then tell Vulpes that she reports to Curtis, in order to get this quest from Vulpes.
PCPlayStation 3Xbox 360 If you help the Legion blow up the monorail but do not have a high enough Speech or reputation level with the NCR for them to help you, you have to go back to Curtis and say "Hsu won't let me help". Curtis then tells you to rig the monorail to explode regardless. However, a glitch may mean that you can't plant the bomb, making the quest impossible to complete. The monorail can still be used to travel to The Strip.
PCPlayStation 3Xbox 360 If you're on bad terms with the NCR and initiate this quest as a Legion supporter, then get on good terms and speak to the Colonel about completing the quest for the NCR, the explosives in the trash can become non-existent and the Control Tower becomes vacant.
PCPlayStation 3 You may not be able to enter the monorail because of a invisible wall glitch before you inform Hsu.
PCXbox 360 There is a chance that the explosives will not be in the trash can by the ticket counter.
PlayStation 3Xbox 360 Sometimes no matter what time or day you're there, the spy will never show up. A possible solution is to reload an earlier save.
PC Upon entering the tower, followers get stuck in an endless loop of appearing a few feet above the ground, settling on the ground, and then reappearing back in the air again.
PlayStation 3 After successfully entering and eavesdropping on the spy, leaving the control tower causes any followers to stop following. They will wait in front of the tower until you talk to them and tell them to stop following and then to follow you again.
PlayStation 3 If you end this quest without saving the monorail, Hsu will not grant you the reinforcements for Bitter Springs, thus making the Quest No, Not Much unsolvable. However, reaching Liked status with the NCR allows Hsu to send the reinforcements before completing this quest.
PlayStation 3 If you started the quest from Hsu, you can still "start" Inculta's side of the quest, effectively exposing the plan to blow up the monorail long before you would normally find out (if you are following the NCR's side of the quest). By the end of the quest, attempting to disarm the bomb will instead force you to plant it, regardless of a bomb already clearly being there. The vent then can be clicked again, ultimately disarming the bomb. Leaving the train will cause it to speed off and explode but you can return to Hsu and tell him of Curtis' "attempted" plot, regardless of the fact that the monorail just exploded.
Xbox 360 The monorail will not permit entry in order to diffuse/plant the bomb and instead only show 'Take monorail to the Strip'.
Xbox 360 After you start the quest make sure to get the key to the control room from Boyd before starting the interrogation; interrogating Silus and killing him will make Boyd impossible to talk or pick-pocketable, making this quest impossible because she gives you the key to the control room.
Xbox 360 If you are helping the Legion, sometimes after you plant the bomb on the monorail, the monorail will not leave the station rendering the quest useless.
Xbox 360 When you disarm the bomb on the monorail, you will not have the dialogue option with Colonel Hsu to finish the quest.