Unidentified (Smithsonian Institution) Tioga, built in 1848 for the Philadelphia & Columbia, among the earliest known railroad photos. Philadelphia was the locomotive capital of America when the Norris Brothers built the Tioga in 1848 for the Philadelphia & Columbia Railroad. In one of the earliest railroad daguerreotypes known, the crew appears dressed in its finest clothes. Only a few hundred individuals in the United States held the respectable title of "Locomotive Engineman."
You can see many photographs from the exhibits in the publication It's Work. The exhibit here is available to travel. Click on the thumbnail image to view the larger image.
Center for Railroad Photography & Art