A couple were actually posted on the first page:YoshiDino90 wrote:It's been ages since I posted, but a few of the crossings on the Sacramento Light Rail line have them. I filmed there back in 2013 and I'll have to find the videos at some point.
viewtopic.php?f=17&t=62#p405
I know MobileRailSpotterRxR on YouTube has a few videos of some of the others as well.