Actually, you haven't proved anything. Except that if you want to put rail near autos, you'd better plan on a fairly land-hungry buffer.
I'll exclude the LA and Michigan City pictures, because those (at least the LA one) appear to be electrified passenger rail (light rail in the LA case), which probably don't interact with freight rail and thus would not be subject to FRA rules. I don't know about Michigan City...
The Richmond photo was perfect though. And the Austin and Santa Fe ones are good too. Those buffer zones, see them? Interestingly, they look very similar in all three photos. Could that be a regulatory standard? Probably so.
So on the Richmond photo (or which ever one you want), but Richmond's is the tightest fit by far... trying to eyeball it from the photo. It looks like the two-track freight ROW is taking up about an equivalent 4-land highway ROW. At least 70-feet, I'd say? Santa Fe and Austin there (both 1-trackers) don't seem to be getting any relief on the buffer zones. I'd guesstimate 50-feet or so?
I never said it wasn't possible anywhere. I was responding to a very specific proposal that Octavian posted. Going to borrow Ken's rendering for the 16th St Bridge and his photo (I can't find a photo off hand, I'm not home this weekend). Tell me - where are we going to put a freight bypass here that is going to keep the FRA happy?
Find me 50-feet of ROW.
I suppose we could barricade off a segment for a single track and that might satisfy the regs... but is that really our easiest or best option? That's all I was saying. Of all the potential options for making passenger rail in/out of Union Station work, I think relocating the freight rail, especially to a busy tight corridor like this, is not going to be our best option.
EDIT: Looking again - those Austin and Santa Fe pics might not be freight rail either. Anybody know? The Santa Fe train at least looks like one that probably does interact with freight rail at some point, but new track, concrete ties, I don't know, maybe not?
Point is - and I'm not sure electricron knows this - not all trains are the same and/or play by the same rules. (Interesting about Baltimore, I didn't know that...those tracks must be seriously overdesigned for what the light rail would otherwise need.)