^^ I've seen that Backlot one used once. Couldn't figure out how to do that one, although suspected that it was off the roof. Sadly, a level of precision jumping that I rarely have!
There's a couple on Pipeline that are useful as well;
If you get onto the roof of the building with the skylight, next to C. Go to the far end, C-side, looking out towards B. If you maneuver yourself to the point of the roof closest to C, you can maneuver yourself to dropping off and rather than hitting the floor you drop into the rafters of the overhang. Again, with a silenced weapon, that one's great.
The other is a bit of an optical oddity. The engine the other side of C, closest to B, if you jump into the section between the engine and the first carriage and then crouch down looking directly at the engine in front of you, if you do it just right, you can actually see through the framework of the engine. Effectively it's like you're wearing x-ray specs, you can see through the engine but no one else can see you. I've only ever tried it with an assault rifle on standard domination, and shooting through the engine doesn't work for me. I suspect however that using a LMG would probably be more effective. Either way, I'm fairly sure that on hardcore, you can kill people by shooting through the engine. At the very least, you can see where people are without them seeing you, which should always give you the drop on anyone trying to take C.