The home of Isabel
Isabel was named after the daughter of the quarry manager, and here's a photo of her, and her brother Peter, who also had an engine named after him too. (which is at Amberley actually).
The three little boys in the story, really did put pennies on the track and were told off because Isabel derailed, but Joe the driver didn't think that they had caused it.
Apparently it's very easy to cook bacon and sousages in Isobel's firebox because it's on a level..and the whistle can deafen the driver because of where it's positioned.