United States. Interstate Commerce Commission. Bureau of Railroad Safety and Service

• Rules, standards and instruction for installation, inspection, maintenance, and repair of automatic block signal systems, interlocking traffic control systems, automatic train stop, train control and cab signal systems
• Rules, standards, and instructions for installation, inspection, maintenance, and repair of automatic bloc signal systems, intelocking, traffic control systems, automatic train stop, train control, and cab signal systems, and other similar appliances, met