I'm doing the quest where you have to find the spy at McCarran, when I'm told to dissarm the bomb on the monorail, I use the deactivation code but the monorail still blows up. The same thing happens if I use science to dissarm the bomb.

Is this a known bug ad are there any fixes for it?

How do you use the code _ I can't get to the monorail before it leaves the station

The event trigger seems to be in an odd position. I find that you can reach the monorail car if you stick to the right.