In The Cab/Water Glass

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This is the Water Glass. This is the MOST IMPORTANT Gauge on Engine 107. This gauge
tells the Fireman where the water level is in the Boiler. The Fireman is always checking the
water level because it is always changing. As Engine 107 uses up water to make steam the
Fireman has to open the Injectors to add more water from the Tender. Engine 107 must
Never run out of water. If the Fireman cannot see any water in the Glass or the level of water
in the glass does not move up and down as the train is moving, the Fireman must tell the Engineer
to Stop the train until the problem is found and fixed.