SPOILERS.. From all the reading I've done, the only way to save the Monorail is to listen to Curtis talking on the radio in the control tower, then going and disarming the bomb. However when I follow him into the tower he just stands in front of the radio forever, doing nothing. Has anyone had any success after getting to this point?
This is what happened to me. Make sure you easedrop or it will say you failed the mission before confronting him. I did that then confronted him, then killed him got the code to disarm, BUT still when I got to the monorail it drove off and exploded. I still completed the mission but monorail KA BOOM
Let me clarify when Curtis goes in go in after and stay hidden before you go up the stairs you should hear him talking over the radio. However if hes not talking you got a glitch. Happened to me too and I had to restart autosave, walk out of tower and back in then he was talking.