What was the name of the dragon that slept in the furnace in 90's cartoon?

I can't remember much about it. There was a dragon that slept in a
furnace to keep warm
Might have had something to do with trains
Name seems in my memory to be something like ismail/issac
Just remember - 'where's ....' 'He's in the furnace'

Know it's a bit of a long shot...