I was out driving during some light (and rare) rains here in Los Angeles county, when I spotted a rainbow arcing over the converging road and train tracks. I pulled over and began fumbling through my trunk for the tripod - and then I heard the Metrolink horn off in the distance. I knew it was the missing element, so I furiously set up, ran to the side of the road, and with little time to spare snapped off a few shots with the train...