In case of doubt as to which valves to open, open every 1 valve which can be found on the locomotive. Only water can drain. To drain boiler water, open valve in 4-inch equalizing line. When an engine is shut down in freezing weather, the cooling system must be drained or steam supplied thru the standby lines. Open valve in steamline to engine water jacket and pump.
Valve is located at the pump end of the engine.
Open valve in water line between the water tank and the cab heaters. Always have water on at the same time as live steam alone will melt the heater elements. Do not admit steam to the cooling system when the engine is running. Otherwise engine will overheat.