I just re-read the Wiki article on the T1s and this bit caught my eye:
Most T1s were degraded to power secondary train when the PRR Board decided to dieselize all first-class prime train in 1948. Some of them were withdrawn from passenger service as early as 1949. All of them were out of service by 1952. All T1 locomotives were sold for scrap between 1951 and late 1955. The last engines were towed westward for scrapping in early 1956.
Wikipedia articles are Public Domain and thus OK to quote with citation.
This statement is certainly in agreement with Dad's photos as I look to be from about age 4 (1954) to age 7 (1957) in the pics.
This pic intrigues me and I'd like to know the back-story:
I have permission to post this photo under Creative Commons guidelines. Library of Congress owns this Jack Delano photo.
I'm just guessing here. The dissipating horizontal steam cloud tells me the train is in motion. The dense vertical column of steam tells me the Hogger grabbed too much throttle and, as the T1s were wont to do, it spun out. This was taken in 1943 and is the prototype T1 so no one had enough experience to know how easily they would spin-out. I remember mention in a Trains Mag article about the T1s that they were so free-steaming (very high horsepower boilers) that they would even spin-out at speed if too much throttle was used.
