After the Rev W Awdry bought the model for his Model Railway,
he discovered that his wheels waddled, so it was named "Duck" by Awdry's children.
Duck's model used to be on display at Nitrogen Studios.
In the Greek dub of the Classic Series, Duck was a girl and called Jackie.
Duck was going to be part of the Steam Team, but he was
replaced by Emily, to give a female character a bigger role.
There was a real engine that carried Duck's Railway Series number,
that engine was scrapped in 1958.