Overtaking loops and three and four track lines

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#1
Are there any examples in North America of four track light rail? Has it ever been proposed? That is four tracks paired by direction. What about double track with overtaking loops at stops and stations? There could be three tracks, with two for all stopping vehicles and one for non-stoppers such as freight traffic and pasenger vehicles not in service, and express services, if non-stoppers only go one way at a time. With four tracks there would be two for all-stoppers and two for all other light rail line traffic.
If, say, a trunk section is shared by two routes of unequal length, two tracks each way, or at least overtaknig loops at stops, would enable the longer route to run express. In many cases it would also make way for other non-stoppers such as freight on the light rail tracks.
Many North Amercian light rail networks have extensive off-street running, so I wonder if there is often room for four track lines. One way of having four tracks in a wide street is to have two tracks in the median and another next to each curb. Another way to have four track street running is to have two tracks for one direction on a different street from the tracks for the other direction.
 
#2
I live in the Bay Area (San Francisco area), and all of our light rail systems are mostly double track, with VTA in San Jose having some very short sections of triple track. No 4 track as far as I know
 





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