This one caught me off guard. After the signal lit showing a clear for an eastbound, I set up accordingly. The sound of a horn from across the river made me quickly re-locate to catch another westbound from a different vantage point with the station structures. It was not as great as I thought but was as good as can be with a few seconds worth of warning. Here, a westbound intermodal train passes through the station in Harper's Ferry, WV. A few other people caught on and decided to railfan as well.