This is just some of the finest footage showing the unique Southern Pacific Cab Forward locomotives. From the Pentrex Show "Southern Pacific Cab Forward Collection" https://rfd.video/PentrexCabForward | Steam Giants

Southern Pacific AC-11 Cab Forward #4274 is seen in trackside action as well as some views from the cab. From the Pentrex show "Last Cab Forward over Donner Pass" https://rfd.video/LastCabForward | Steam Giants

Southern Pacific used the giant unique cab forwards on Tehachapi as well! Here is some footage from the Pentrex show "Southern Pacific Cab Forward Collection" https://rfd.video/PentrexCabForward | Steam Giants

No, you are not seeing double. This is Southern Pacific 4449 running along the (I believe) Yakima River in 1989. This clip is from a unique video called "Reflections". Each scene shows a train and its reflection, like this clip. It's quite "artsy". :-) On sale this week for $9.95: http://rfd.video/TrainReflections | Railfan Depot