Caption: These "Clover Bar Transfer" trains would run regularly between the main yard in town, Calder Yard, and the just-east-of-town yard at Clover Bar. Clover Bar sit in a heavily industrial area, dominated by chemical plants and refineries. It, therefore, handled the more hazardous shipments, and moved them out of the risky Calder Yard, which had housing up against its northern border and housing not too far away on the south side.