SA-26 RELAY VALVE
This “SA-26” Independent Brake Valve Portion is a limited capacity, self-lapping, diaphragm operated type regulating valve which provides a manual means of controlling the locomotive brake cylinder pressure regardless of the automatic brake valve handle position or the state of the automatic brake on the train. When the “26-L” Locomotive Air Brake Equipment is properly set up, the independent brake is not restricted in its operation by features such as dynamic interlock or blending of friction and dynamic brake, and is always available to The locomotive operator (engine man). The Independent Brake is the primary brake when operating a “Lite Locomotive. LITE LOCOMOTIVE” indicates a single locomotive or consist of locomotives only with NO OTHER VEHICLES in the consist.