- “What is your name?""Montague, Sir; but I'm usually called 'Duck'. They say I waddle; I don't really, Sir, but I like 'Duck' better than Montague.""Good! 'Duck' it shall be.”
- ―Sir Topham Hatt meeting Duck for the first time[src]
Montague, affectionately known as "Duck" because of his supposed waddle, is a Great Western tank engine who runs his own branch line with Oliver, and is number 8. He holds great pride in being Great Western and this results in him having a strong work ethic. This can, however, be a cause for friction with the other engines, when he insists that his way is the only right way to do things.
In The Railway Series, Duck has two Great Western autocoaches named Alice and Mirabel. In the television series, he has three Great Western Slip Coaches, all three of them are unnamed.