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The Boiler Check Thaw Valve uses steam from the boiler to thaw out the inner workings of the Boiler Check Valve in cold weather. When 6167's original configuration, the Thaw Valve was connected to the turret and operated by a valve on the Turret Manifold. Eventually the CNR replaced this with a valve coming right off the boiler next to the Boiler Check Valve. The
disadvantage to this arrangement is that now, one must exit the cab to open the valve.
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