The building sits on a foundation of light brownish sandstone with a whitish sandstone sillcourse running on top. The long walls are divided into sixteen bays by projecting brick piers; each bay contains a single window or door. The windows are narrow, tall six-over-six sash units with a three-light transom above, placed in an arched head opening with a five-piece segmental sandstone lintel above and a sandstone sill below. The building's ends each contain a double doorway and a coupled window on the second story above. The flanking sections of the two-story blocks contain single second-floor windows. The building has a gable roof on the main section, with hipped roofs on the two-story blocks; the roofs are covered with modern asphalt shingles. The eaves have sheet metal cornices. On the track side, a wooden canopy runs along most of the building. The canopy is supported by cast iron columns. The Express Building is a single-story L-shaped, brick building with a hip roof. It measures approximately 98 feet by 82 feet along the longest sides. It sits on a light brownish sandstone foundation. The elevations are divided into bays by brick piers, with each bay containing a freight door or window.