Meh, while the beginning of the quest is really good, with the sneaking part, etc. the ending is bugged. It is not possible to save the monorail, it will explode regardless of what you do. First, it seems to be kind of a luck-act to get into the train. I needed many reloads for it. Second, even after I've defused the bomb, the monorail will explode... but the questlog says, all is ok. Sadly, I don't know if this only happens if you defuse the bomb via skill, because that's what I have done and I don't have any older savegame. Would have liked it to test the defusing with deactivation code, but ... I quicksaved after I got the bomb and therefore couldn't try again. Don't want to reload to my last hard-saved game... So I'll guess the Legion has won... this time, thanks to Obsidians help.