Donald and Douglas

Donald, NWR No. 9; and Douglas, NWR No. 10 are twin Caledonian McIntosh 812s on the North Western Railway from Scotland. They arrived on Sodor in 1959, although Donald was the one expected; with Douglas escaping alongside with him, due to the fact he would of eventually been scrapped and neither couldn't stand being separated from the other. They caused problems upon arrival, but later on The Fat Controller accepted for the both of them to stay. Donald and Douglas primarily work on the Arlesburgh Branch Line, alongside Duck and Oliver, but also work on the Brendam Branch Line and The Main Line on certain occasions. In 1967, Douglas saved Oliver from scrap, and as a thank-you; he and Oliver both share Toad the brakevan.

Basis
Donald and Douglas are based on Caledonian McIntosh 812s, which were built in 1899.

Livery
Donald and Douglas originally were painted in BR black, with the British Railways logo on their tenders and numbers on the sides of their cab. Prior to their travel to Sodor, their drivers removed their numbers in order for Douglas to escape with Donald. Shortly after arrival, Donald and Douglas had the numbers 9 and 10, respectively, painted on their tenders to help avoid confusion. This was of no use, when Douglas accidentally shunted Thomas' Special Coach into the wrong siding, Donald and Douglas switched tenders to pretend to be the other, which backfired badly when The Fat Controller noticed what had happened.

After the twins were allowed to stay, The Fat Controller offered the twins a new coat of paint, and they choose NWR Blue. They were also given nameplates to avoid further confusion.