Albumen photograph on mount depicting a “Porter” light locomotive marked “CITY & SUBURBAN R.R.” and numbered “3,” produced by H. K. Porter & Co. of Pittsburgh, Pennsylvania. The image presents a full side profile of a compact street or industrial locomotive, consistent with late 19th century promotional or catalog photography. The photograph measures approximately 5 x 8.5 inches on an 8 x 10 inch mount, with printed manufacturer’s information below the image.

The locomotive features an enclosed cab with multiple vertical windows, a roof-mounted whistle and stack, and prominent lettering “PORTER” across the side panel. A large headlamp is mounted at the front, with a cowcatcher and visible wheel assembly beneath the body. Interior details including gauges and fittings are visible through the cab windows, while the track and platform beneath the locomotive suggest a staged display setting.

Mount text reads “H. K. PORTER & CO. BUILDERS OF LIGHT LOCOMOTIVES” followed by “ALL SIZES, DESIGNS AND GAUGES; FOR PASSENGER AND FREIGHT SERVICE, LOGGING RAILROADS, STEEL WORKS, CONTRACTORS’ USE, PLANTATIONS, MINES, &C.; ALSO, MINING LOCOMOTIVES AND STREET MOTORS, STEAM OR COMPRESSED AIR PITTSBURGH, PENN’A.”