To my knowledge, the "PT", i.e. Passenger Tenders were used only on the Niagara class (they were delivered with 'PT' tenders from Alco), and Hudson class. By 1946, the NYC was purchasing "PT" tenders for use on most of the Hudsons. There are even photos of the streamlined Hudsons equipped with "PT" tenders still painted in two-tone gray. The books "Know Thy Hudsons" and "Know Thy Niagaras" will provide a wealth of information.
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