|Portly Swans Greeting? Not really.|
|Top Cover access holes (the other half is similar to this)|
|Plugged holes in the Boiler Top Plate|
|Plan view of boiler top plate with plugs shown in red|
|Access plug removed|
Later Sentinel locos such as 9622, changed the plugs for nozzles with a steam supply connected to them directly. In this way, the superheater and tubes could be cleaned simply by turning on a steam supply valve. Currently there is no plan to put this on to 7109 although it's very tempting!