The F-1 Selector Valve performs the function of commanding the brake equipment on the locomotive to lead or trail position of the adjacent locomotive and ensures operation of brakes in the trail locomotives when initiated from the lead locomotive.
The Auto Drain Valve automatically discharge precipited moisture from Reservoir with every operating cycle of control device as well as manual draining of moisture through operating by manual device.
The N-1 Reducing Valve reduces the pressure of compressed air supply to a constant predetermined value and delivers the same usually for operation of auxiliary devices.