The heart of the EPIC?II brake equipment, the pneumatic equipment rack is completely self-contained. Equipment functions are grouped and valve portions designed so that valve interdependencies are minimized. This method greatly simplifies the pneumatic equipment and reduces the problems encountered when troubleshooting other air brake systems. Designed to handle human waste and discharge treated wastewater directly to the roadbed, Microphor¯ sanitation systems include models that use between 16 ounces and 2 quarts of fresh water per flush, biological digesting treatment tanks, chlorinators and a variety of optional equipment such as fresh water supply tanks. Toilets are available in stainless steel, powder-coated stainless steel and vitreous china. Treatment systems are available in standard-sized plastic tanks for in-car installations. Tank options include double-walled, insulated tank construction with heating systems for cold weather protection.