Envelope reads "First steam shovel at work on Posey tube 6-12-25." Photograph shows a large steam shovel in the center of the frame sitting on a slightly excavated area. It is dumpling a load into a truck parked in the left hand side of the frame. a chimney on the engine is discharging steam. Both construction workers and spectators mill around the site. In the bakcground a man can be seen perched at the top of a telephone or electrical pole. A brick building in the background reads "Saroni-," and a sign on the steam shovel reads "Marion shovel -Model 21." Posey tube was a tunnel built to connect Oakland and Alameda during Mayor Davie's administration.