I am in the process of planning a small HO switching layout based on the UP. I am in need of information regarding small urban rail served areas. I am thinking of a railroad that will enable me to switch about 6 cars at a time to various small industries. My initial thoughts ( and bear in mind I am English and know very little about US practices ) are a steel company, Household heating oil co, and perhaps 2 industries that would move freight in reefers, such as a food processing company and perhaps a removal firm. Thoughts please.