Sometime in the past, the owner has remove the safety valve and respective bush and araldited on a lovely turned brass locomotive chimney. This has just been glued over the hole, meaning the boiler will no longer hold pressure. After doing this, the owner has then gone to the trouble of making a very long plug to fit in the water level plug hole, even though the boiler can no longer be used.
Maybe he had an idea for the engine - I will never know, I'll leave it to you readers to speculate!
The long filler plug!