The camera angle from Carleton Watkins's position atop a hillside produced a dynamic image with extreme diagonals and numerous triangles. Watkins took this picture at Port Costa off San Pablo Bay, the terminal where transcontinental trains arrived from the east. There, passengers bound for San Francisco transferred from trains to ferry boats for the final leg of their trip. The smoke billowing forth from both the train and the ferry suggest that they have either recently arrived or are about to depart.