Thanks, Bob, and thanks to my friend nutbar for posting this. Of all of Professor Nutbar's beautiful locomotives, this one is my favourite.
Andrew, the 1533 was formerly CNR 1325, and before that Canadian Northern 1325, an H-6-d built in 1910/11, by the Montreal Locomotive Works. Cylinders were 22"x26", with a boiler pressure of 180 pounds. With 63" drivers, the 1325/1533 had a haulage rating of 30%. (CNR's way of expressing 30,000 lbs. of tractive effort.)
Bigsteel, this model came with a removeable oil bunker, as some of these locos served in western Canada. With that removed, there is a modelled coal bunker, but no side extensions, so we hunted through nutbar's collection of CNR books, looking for photos that showed either the 1325, 1533, or any other loco with a similarily built-up bunker. We finally found sufficient photos that showed all sides of the extension, allowing an accurate copy to be made from strip styrene. It was surprising to me, though, how many different styles were used on the various Ten Wheelers.
The prototype 1533-2 (this is the second use of this number for a CNR Ten Wheeler - the first was on an I-4-a, built in 1904 and scrapped in 1925) is still in existence, at least according to the reference that I have available, in Chester, Pa., on the New Hope & Ivyland RR, and is owned by United Scale Models. (Mister Nutbar may be able to update this info.) According to my source, there are a total of 11 CNR 4-6-0s of various classes still around.
Wayne