The triple-track mainline at Fullerton, California is a great place to watch and photograph trains.
In addition to a steady procession of transcontinental container traffic, Amtrak and Metrolink passenger trains operate over the line and make stops at the old Santa Fe station.
Centralized Traffic Control with bi-directional signaling on all three lines allows dispatchers flexibility to route trains in either direction over any mainline track. There are crossovers immediately east of the station platforms.
The challenge of photographing from the pedestrian bridge is navigating the wire mesh. While my Lumix LX7 with its small diameter lens did a better job of getting through the fence, I opted for my Fuji camera because I wanted a longer telephoto lens to bring in the stack train which had stopped on the middle line waiting for a signal.
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