I keep coming back to your videos. Just amazing in their realism and historical accuracy. Helps bring the Curve in its heyday a lot more clarity, both literally and figuratively. Damn fine work.
Nice graphics. Almost looked like a colorized old film reel. Just one nit to pick though: Pennsylvania Railroad was unique, some would say peculiar, in the use of first generation diesels. As Don Ball Jr. noted in The Pennsylvania Railroad 1940's-1950's, Page 144, the PRR didn't mix diesel types even from the same builder. So your EMD F unit lashups of F3 and F7 diesels would not have been used in this manner. David R. Sweetland wrote, in the Introduction to Robert J. Yanosey's Pennsy Diesel Years, Vol. 3 (Page 3), that this practice of matching diesel classes continued until 1962!
The casual observer probably wouldn't notice as all Long Island steam locomotives at this time were PRR models in the H, G and K classes. On the other hand, LIRR ran north on its namesake island and the connection with the PRR was through Penn Station New York; strictly electrified territory. A LIRR steam engine would have to be towed with no fire through that area.
How many trains a day did HSC see at that time? Do we know? This seems like the activity of several hours compressed down to something reasonable for youtube.