A few miles north of Harrisburg, Pennsylvania the Rockville bridge was the longest stone arch bridge in the world when it was completed by the Pennsylvania Railroad in 1902. It is 3,280 feet (1,164 m) long. The boat launching ramp at the northwest end of the bridge in Maryville, PA is a great spot to watch and photograph. As you can see in my photo, being on the north side of an east-west rail line makes it a problem for photography. The north side is always in shadow. As we often find when out train watching, the south side of the line may not have good vantage points. Film photographers must be careful with exposure. Digital photographers have it better because a good camera will get the maximum detail in the shadows so you can PhotoShop the frame for a better exposure.
You can see a good capsule history on Wikipedia.
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