Back in 2024 Morrison, the first major DSP&P destination, celebrated its sesquicentennial. A video of the celebration does a wonderful job of telling the town's history. In particular, it honors the South Park Line and you'll see railroad history throughout the video (There's even a man impersonating David Moffat). Check out the 10:38 mark and you'll see some more railroad history as well as a shot of the restored track in town that was dedicated that day.
