[TRS22] - PRR's Middle Division in the 1950s

First off, I am very sorry for this taking so incredibly long to make. I had a lot of stuff going on in my life. I also didn't take into account that it would take so long. But anyway, here's the first of five videos for 2026. This is a look at the Middle Division from 1951 to 1957. During that period, steam on the PRR gradually gave way to diesel locomotives. See M1bs, L1s, K4s, I1s, and J1s handling passenger and freight. See diesels from EMD, ALCO, Baldwin, and FM, E8s on passenger trains, F units and Sharknoses on freight, and RSD-12s and Centipedes serving as helpers. The experimental Aerotrain is also featured. And yes, I know that this video is longer than most YouTube video essays. Deal with it. Intro song:    • Proud Surroundings   0:00 Intro 1:40 Marrysville 11:05 Duncannon 16:34 Mifflintown 27:09 McVaytown 33:30 Petersburg 38:12 Horseshoe Curve 1:07:41 Gallitzen/Tunnel Hill